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Toilet Paper Algorithms

ziani writes "Computer science professor and ex-Apple technologist Don Norman posits a new "forcing function" in toilet paper use algorithms." Browsing through his website is a good way to kill a couple of hours.

203 comments

  1. Toilet paper == outdated by electricmonk · · Score: 2, Funny

    These days, I can just use a couple of VA Software stock certificates and get the same effect. Plus, it is cheaper than toilet paper!

    --
    Friends don't let friends use multiple inheritance.
  2. Heh by zapfie · · Score: 1, Redundant

    from the you-know-you're-taking-too-long-in-the-bathroom-wh en department.

    --
    slashdot!=valid HTML
  3. Snowcrash by MisterBlister · · Score: 3, Interesting

    I wonder if he was inspired by Snowcrash, and the long discussion of the issues related to toliet paper in the Fed Building in which yt's mom works? Sounds pretty similar, but less funny.

    1. Re:Snowcrash by martyn+s · · Score: 1

      It's whitey!

  4. Allow me to explain by Subcarrier · · Score: 4, Funny

    Academics, especially professors, spend a good deal of their time brown-nosing and kissing other people's asses in the hopes of securing yet another research grant. Hence, the seemingly odd fascination for toilet paper, the uses of.

    --
    "I have opinions of my own, strong opinions, but I don't always agree with them." -- George H. W. Bush
    1. Re: Allow me to explain by Subcarrier · · Score: 1

      Flamebait? Weird. Having spent several years of my life as a researcher, you'd think I'm allowed to make that joke. It's certainly true enough. Maybe the honorable moderators are a little out of touch with reality?

      Of course, the current downturn in economy is enough to make the best of us lose our sense of humour.

      --
      "I have opinions of my own, strong opinions, but I don't always agree with them." -- George H. W. Bush
    2. Re: Allow me to explain by Omar+El-Domeiri · · Score: 1

      Maybe the moderators just wish it wasn't the case profs had to kiss asses like they do. Because that unfortunate reality is one of the flaws in an otherwise perfect occupation.

    3. Re:Allow me to explain by Monkelectric · · Score: 2

      You're lucky if computer nerds are using kleenex/toilet paper on their NOSE/ass.

      --

      Religion is a gateway psychosis. -- Dave Foley

    4. Re: Allow me to explain by pboulang · · Score: 1

      Meant that the gasses around which you are kissing are flame bait...

      --

      This comment is guaranteed*

      *not guaranteed

    5. Re:Allow me to explain by sahala · · Score: 2
      Academics, especially professors, spend a good deal of their time brown-nosing and kissing other people's asses in the hopes of securing yet another research grant. Hence, the seemingly odd fascination for toilet paper, the uses of.

      Witty, but Norman has very little need to brown-nose and kiss ass. People come to him for attention, not the other way around.

  5. Size vs. Use by Anonymous Coward · · Score: 1, Interesting

    I would be interested to see statistics on toilet paper use vs. size of the roll. My bet would be that people will use more paper when the roll is full sized compared to when it is smaller due to the number of rotations and time involved to get the same amount of paper. This may be an argument to have a number of small rolls instead or one big one at commercial facilities where toilet paper use is a noticable cost.

    1. Re:Size vs. Use by trajano · · Score: 1

      Perhaps someone can use this as a poll question on slashdot. :-)

      --
      Archie - CIO-for-hire :-)
    2. Re:Size vs. Use by Anonymous Coward · · Score: 0

      doubt it matters, i think the toilet paper balling technique is learned over many years and from many different rolls. how would the new "double rolls" factor in to this?

    3. Re:Size vs. Use by ahaning · · Score: 1

      When using TP at "commercial facilities" (by this, I assume you mean restaurants, reststops, work, school, etc) it's usually that 10" roll of half-ply sandpaper that has great absorbance -- but that's about it. However, this means that you need to make your own multi-ply's. So, whereas at home, I may take 4 "sheets" of Charmin 10-ply Extra Smooth w/Aloe Vera and Vitamin B, I need 10 or 15 sheets of the half-ply stuff to even get near the usefulness of the Charmin.

      I've thought before that they might as well use the nice smaller rolls since I use more of the big rolls since it's so bad. However, some people put TP around the seat if there aren't any paper seat covers available, which would be a waste of the good stuff. Also, this would require the custodians to have to change the rolls more often (it would also make them much more expensive since you'd need 2-3 cardboard tubes for an equivalent amount of crap paper.

      --
      Withdrawal before climax is very ineffective and those who try this are usually called "parents."
  6. I knew it by C0LDFusion · · Score: 1

    Apple only hired guys who knew their crap.

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    Only in slashdot are posts of solidarity modded at -1 Redundant, while posts of antagonism are modded as -1 Flamebait.
  7. Forcing a Function? by Mike+Mentalist · · Score: 0

    Toilet humour alert;

    Using 'forced functions' and 'toilet' in the same paragraph is a bit 'I need to go RIGHT NOW' prompting I feel.

    --
    I put my books on Amazon, Smashwords, Demonoid, ISOHunt and Pirate Bay. Search for 'Michael Cargill'
  8. hasta be sed by Tablizer · · Score: 3, Funny

    This topic is full of shit!

    1. Re:hasta be sed by Tony+Hoyle · · Score: 2

      Offtopic? I can't think of any way it could be more *on* topic!

      Mods on crack again...

    2. Re:hasta be sed by Anonymous Coward · · Score: 0

      Offtopic? I can't think of any way it could be more *on* topic! Mods on crack again...

      He/she/it/Elizamod probably just didn't get it.

  9. Hmmm.... by Kirby-meister · · Score: 4, Funny

    ...I knew that degree in CS would come in handy some day.

    1. Re:Hmmm.... by Tablizer · · Score: 2

      I knew that degree in CS would come in handy some day.

      Review:

      BS degree - Bull Sh*t

      MS degree - More of the Same

      PHD degree - Piled Higher and Deeper

    2. Re:Hmmm.... by PD · · Score: 1

      If you're coming in handy, you'll definitely need toilet paper to wipe up.

    3. Re:Hmmm.... by mrseth · · Score: 2

      PhD = Pizza Hut Delivery

    4. Re:Hmmm.... by colonelteddy · · Score: 1

      ...I knew that degree in CS would come in handy some day.

      Oh c'mon! We all know that's what Arts degrees are for!

      --
      c - a blessed +5 grain of salt
  10. When you run out.. by Dynamoo · · Score: 1

    When you run out.. just used a printed out copy of a Microsoft EULA!

    --
    Never email donotemail@WeAreSpammers.com
    1. Re:When you run out.. by Xenographic · · Score: 1

      I still want some with the DMCA on it. ThinkGeek hasn't responded to my request for it just yet... :[

    2. Re:When you run out.. by Anonymous Coward · · Score: 0

      Or use Linux source code. It's worthless, and reading it while you're on the crapper will make the shit come faster.

    3. Re:When you run out.. by Xentax · · Score: 2

      Me? Nah...

      It's not *my* ass that I want every Microsoft EULA shoved up...

      Xentax

      --
      You shouldn't verb words.
  11. Yep by DigitalHammer · · Score: 1

    Excellent! This will invalidate the first-grader's rant for a paperless crap session!:

    "Be a man, use your hand." :)

    1. Re:Yep by Anonymous Coward · · Score: 0

      Yeah, this is the real problem with the so-called "paperless office"

  12. This is why by Anonymous Coward · · Score: 0

    This is why I majored in Finance and minored in CS.

  13. Too much time on their hands by Hater's+Leaving,+The · · Score: 1

    I used to think that I needed to get a life, but heck, this takes the cake.

    What kind of anal person wastes time on scheduling/queuing algorithms for TP?!?!

    Having said that - I have the chindogu book, and it looks like this guy is _not_ a minority of one. Worrying...

    Havng said that the banner you hang from your forehead in order to cover your yawning maw and smultaniously indicate which stop you'd like to get off at when wanting to sleep on the subway train is darned useful.

    THL.

    --
    Keeping /. cynic density high since the fscking Kwhores/trolls arrived.
    1. Re:Too much time on their hands by Verizon+Guy · · Score: 1

      The best part is that he finally reorted to the hotel-style wall holder with the deep hole in it to store a spare roll still in its wrapper... which is some huge improvement over placing a new, unwrapped roll on top of the reserve tank or under the sink... how? I don't know, maybe this guy has a bad case of fecalphelia or something.

      --

      Aw, fuck it. Let's go bowling. - The Big Lebowski

    2. Re:Too much time on their hands by Tablizer · · Score: 2

      What kind of anal [retentive] person wastes time on scheduling/queuing algorithms for TP?!?!

      I think this is a self-answering question if you think about it.

    3. Re:Too much time on their hands by jweb · · Score: 5, Interesting

      What kind of anal person wastes time on scheduling/queuing algorithms for TP?!?!

      It may seem stupid at first, but it could make for an easy introduction to algorithms for young students. Just because it's a somewhat inconsequential topic to everyday life doesn't mean it's not something that's useless.

      For example, in my macroeconomics class my freshman year of college, the professor attempted to explain many of the economic concepts in terms of beer and college students. Law of supply and demand: Price of beer goes up, supply of beer goes up, but demand for beer goes down (college students, of course, being limited in budget). Compliments and substitutes: Price of pretzels goes down, demand for beer goes up.

      Yes, they are simplified examples, but I firmly believe the only reason I remembered anything from that class to this day is because of the examples she used.

      --

      Think For Yourself. Question Authority.
    4. Re:Too much time on their hands by nelsonal · · Score: 1

      Actually its because economists guzzle the stuff like it was water. I went to an econ conference once, and it was the most surreal experience. They generally had coolers and kegs at each dinner, but it was topped off each night by a trip to the local bar.

      --
      Degaussing scares the bad magnetism out of the monitor and fills it with good karma.
    5. Re:Too much time on their hands by Anonymous Coward · · Score: 0

      its not so much that he made them, they were obviouse and anything w/ something higher than a gangliea could figure it out in 2 seconds, its the time he wasted writing it up, a testimate to this mans ability to stray from the human genome.

    6. Re:Too much time on their hands by Dirtside · · Score: 2

      I don't know if it's even that inconsequential. Think about all the times you've had to deal with messed-up toilet paper systems in publicly accessible toilets (restaurants, stadiums, theaters, etc.). What if someone were to spend a few weeks determining all the parameters of various toilet paper setups, and producing some kind of definitive work on the subject?

      Yeah, I read that and it sounds like I'm joking, but I'm not. Surely there can't be more than one or two "optimal" toilet-paper-dispensing solutions, and it seems bizarre that these were not determined years ago. It doesn't seem like the circumstances surrounding the use of toilet paper could have changed all that much in the last fifty years.

      I mean, let's think about it. There's two major categories of toilet paper usage: public (restaurants, stadiums, theaters, amusement parks, businesses, etc.) and private (residences). Obviously, private TPS (Toilet Paper Systems) don't need any of the security features that public systems do.

      Let's look at private TPS first. What are our parameters and needs? Well, in most situations, replacement TP rolls are within reaching distance of someone sitting on the toilet, so that's not a problem -- having two rolls doesn't really help that much, because you're STILL going to have to replace the rolls at some point (probably when one expires is the proper algorithmic way). The biggest problem I've noted with private TPS is that the volume of space allocated to the roll tends to be just small enough that a full roll comes into frictional contact with the supporting wall -- so when a roll is fresh or near-fresh, it can be difficult to draw it properly (you tend to get tearing, due to friction). Two solutions to this: 1) Have the axis of the toilet paper out far enough from the supporting surface so that a standard-sized roll will not touch it. 2) Have a depression carved into the supporting surface (usually in the form of a semicylinder) so that the full roll does not protrude too far out from the supporting surface. Ideally, the depression should be large enough so that a standard-sized roll does not touch any part of the inside of the depression. Also note that any holder or support mechanism should allow for significant expansion in the size of toilet paper rolls, since the "standard size" may change (and if it gets smaller, that's not much of a problem, but it's more likely it'll get bigger, and we don't want to have to retrofit our holders later if we can avoid it).

      Other factors... the spindle itself should be a single unit, usually a pair of size-offset cylinders attached by a spring. The individual cylinders of the spindle should absolutely NOT be able to come apart (except by violent prying). The spindle's exposed area (i.e. where the roll hangs) should be sufficiently long that a standard-size TP roll can spin freely without being crushed between the arms of the holder.

      (Also note that these parameters call for a standard size roll of toilet paper, which would theoretically be specified by shipping dimensions, i.e. diameter and height -- if a company wants to make a single-ply roll and a double-ply roll, the roll should be the same dimensions, meaning that the double-ply roll will have fewer sheets.)

      Should the spindle be able to move freely, and spin in the holder, or should it be more or less locked in place (by a physical obstruction, or by friction?), letting the cardboard TP spindle itself rotate around? As long as the TP roll itself has sufficient space inside the cardboard spindle to rotate freely about the support spindle, then the support spindle doesn't need to be able to rotate...

      See how much thought can go into just a few aspects of a problem like this? We don't think much about how things like this go, but imagine if you went the rest of your life without ever having to deal with poorly-designed toilet paper mechanisms again. It wouldn't necessarily be something you'd notice, but that would be the point -- a single medium-sized application of brainpower, once, could save millions of people from ever having to think about it.

      --
      "Destroy science and religion. Science would re-emerge exactly the same; but not religion." - Penn Jillette, paraphrased
    7. Re:Too much time on their hands by sahala · · Score: 1
      Law of supply and demand: Price of beer goes up, supply of beer goes up, but demand for beer goes down (college students, of course, being limited in budget). Compliments and substitutes: Price of pretzels goes down, demand for beer goes up.

      While I see what you mean, I think you have this the wrong way about. Assuming that everything else is constant (ceterus paribus), price is a function of overall existing demand and supply, not the other way around. The price of beer will only go up/down if there are conditions that cause a shift in supply and/or demand.

      Rather than try to retro-fit your example (which is a bit flawed to begin with) here's a simple page that I pulled off google that explains basic supply and demand.

      This of course is the classical view of macroeconomics, which is probably what your professor was teaching.

    8. Re:Too much time on their hands by Atrus5 · · Score: 1

      Just because it's a somewhat inconsequential topic to everyday life doesn't mean it's not something that's useless.

      After removing the negative that nullify each other you get:

      Just because it's a somewhat inconsequential topic to everyday life means it's something that's useless.

      Obviously not what you intended (it also makes it much more obvious that you could have removed "something that's" and saved everyone the trouble of reading gratuitous charachters). I keep telling people that a even number of negatives in a sentence is going to cause a disaster, like an intergalactic war, a hole in the ozone layer, my fingers falling off from writing corrections, or possibly even people-who-were-trying-to-read-the-sentence's heads exploding! As an example,
      "None your base are not belong to us"
      is a most confusing and statement. Players might be confused about the storyline and thousands of geeks would be forced to utter a gratuitous syllables. I doubt that many people's confusion would change, except for a decreased probability of them understanding, so overall the damage would be minimal, but I'm not one to rely upon ignorance and confusion for protection.

      *runs for protection*

    9. Re:Too much time on their hands by ivrcti · · Score: 1

      Granted, this particular algorithm is obvious and trivial in it's implementation. The real secret is to use that algorithm as an implementation pattern to a purely logical programming problem. Most great application breakthroughs (in many areas of science) are achieved by looking at patterns used in similar, but unrelated problems.

  14. I'm disappointed... by Kobal · · Score: 1

    From the header, I believed this was a news about Lisp...

    1. Re:I'm disappointed... by haystor · · Score: 5, Funny

      I think Emacs has a minor mode to enforce correct toilet paper selection.

      --
      t
  15. Let's simulate it ! by Raiford · · Score: 5, Funny
    Perfect problem for a language that supports multiple threads. Sounds like a nice Java applet.

    --
    "player 4 hit player 1 with 0 stroms"
    1. Re:Let's simulate it ! by pnatural · · Score: 2

      But aren't java threads synchronized? Ew...

      I agree, tho, java is a perfect language for toilet algorithms.

    2. Re:Let's simulate it ! by Anonymous Coward · · Score: 0

      brings new meaning to the term crapplet

    3. Re:Let's simulate it ! by cduffy · · Score: 2

      Ah, but synchronized functions in Java prevent concurrent usage. I'd be much more concerned without a lock protecting said function.

    4. Re:Let's simulate it ! by Fjord · · Score: 2

      uh, what do you think that means? Java provides synchronization in the language, but it only applies where you code it to be. If you don't put in syncronization, your thread can do dangerous things to each other.

      --
      -no broken link
  16. Toilet paper? by lethalwp · · Score: 0, Funny

    So you can't use the 3 shells?

    *Moohahahahaa*

    (Demolition Man)

    1. Re:Toilet paper? by Verizon+Guy · · Score: 1

      ROFL ya took the words right out of my mouth. For those of you that don't get the obscure reference, Sly Stallone was confused in Demolition Man, after he was un-cryogenically frozen in the future, by the three shells in the bathroom instead of toilet paper. He never did figure it out.

      --

      Aw, fuck it. Let's go bowling. - The Big Lebowski

    2. Re:Toilet paper? by ArsonPerBuilding · · Score: 1

      Just how did the shells work? I never got that.

      --
      1 tequila 2 tequila 3 tequila floor
    3. Re:Toilet paper? by Strike · · Score: 1

      Just how did the shells work? I never got that.

      /me points and laughs

    4. Re:Toilet paper? by tx_mgm · · Score: 1

      he doesnt know how to use the sea shells!!
      hahahahahaha!

      *ahem*
      well thats understandable

      --
      Gentlemen...BEHOLD!
      -Dr. Weird
    5. Re:Toilet paper? by kasperd · · Score: 1

      He never did figure it out.

      He did get somebody to explain it in the end. Meanwhile he just used the fines he would have in his hand two seconds after saying any four letter words.

      --

      Do you care about the security of your wireless mouse?
    6. Re:Toilet paper? by Rande · · Score: 1
      It's based on a very old joke.


      New guy in town walks into the bar, and after a few drinks, heads to the toilet.

      Looking inside the stall, he sees no toilet paper, only 3 seashells where it should be.

      He wanders back and asks the barman what the shells were all about. Barman points and laughs and says 'It's the great new thing, try it out! Just don't press the third seashell!'.

      So the guy walks back to the toilet, does his business and presses the first seashell. Quick as a flash, a spigot pops out and cleans and powders his arse.

      Guy feels quite impressed. So he tries the second seashell. Quick as a flash, a soft but rather robotic arm seizes his penis and gives him a very enjoyable jerkoff.

      Filled with curiousity, the guy can't resist pressing the third shell.


      Guy wakes up in hospital in total agony..."What happened he asked"

      "You pressed the third seashell didn't you?"

      "Er, yeah, was that wrong? What was it?"

      "Automatic Tampon Remover"

  17. over/under by Anonymous Coward · · Score: 1, Insightful

    But what about the over/under dichotomy? Most people put the toilet paper in the holder so it unrolls over the top, but a sizable minority (myself included) put it in there so unrolls from the bottom. Each group drives the other nuts.

    This should be taken into account somehow when exploring any toilet paper algorithm.

    1. Re:over/under by KarmaPolice · · Score: 1

      I like the "under dichotomy" myself. It makes it much easier to roll the paper back on the roll when the cat has unrolled half a roll for fun...it's my girlfriends cat - I wanted a dog!

    2. Re:over/under by vsprintf · · Score: 1

      Yeah, you're a woman. Nice try, posting AC.

    3. Re:over/under by Anonymous Coward · · Score: 0

      I bet your girlfriend is a dog.

    4. Re:over/under by Tackhead · · Score: 2
      > But what about the over/under dichotomy? Most people put the toilet paper in the holder so it unrolls over the top,

      (ahem. the way God intended.)

      > but a sizable minority (myself included) put it in there so unrolls from the bottom. Each group drives the other nuts.

      Unrolling from the top makes sense - it's the middle of the night, you take a dump (or leak, if female), and you just wanna paw at the roll (why turn the light on?), and wow, there's a sheet or two or three in your hand.

      Or "huh, wheredafuxdapapuh? fuggin underrollin' roommate", and you have to shove the roll away from you until the pieces of TP finally emerge from behind the roll in the wall.

      OK, heretic. What's your excuse?

      (Actually, the excuse of the other guy who said "under is best because it's easier to re-roll if the cat unrolls it" made sense. But as long as I'm in the company of an under-roller, what if there's no cat in the house? Seriously, what's the rationale for under-rolling?)

    5. Re:over/under by steveg · · Score: 1

      Before I got the TP dispensors with the top guard, my cats liked to unroll it frequently. Rerolling never became an issue though -- in conjunction with unrolling it they would chew a big gouge in what was left. Replacing the roll was the only option. And cleaning up the shredded paper.

      The current dispensor has a chrome 'mud-flap' arrangement that simultaneously discourages the cats and enforces an over-the-top loading of the TP. As a bonus it provides a tiny bit of friction which simplifies the 'tear off' process. Decorative too.

      --
      Ignorance killed the cat. Curiosity was framed.
    6. Re:over/under by Anonymous Coward · · Score: 0

      I knew a guy who used to be in the Air Force, and he said dirty pranksters in the AF would do despicable things like putting shit (not a euphemism) on the under-rolling toilet rolls.

      Since you can't see the shit, you just reach up and grab the shitty bottom-of-the-paper, instant unhappiness.

  18. Nice idea, but... by Heraklit · · Score: 2, Insightful

    Has anyone researched yet when a common-sense idea beomes an algorithm that computer scientist discuss?

    I mean, ok, nice idea, but do we really need computer scientist for this (except for using buzzwords)?

    1. Re:Nice idea, but... by Verizon+Guy · · Score: 1

      If you read his web site you'll see that he moonlights as a proctologist.

      --

      Aw, fuck it. Let's go bowling. - The Big Lebowski

  19. Usability a curse.. by Space+Coyote · · Score: 5, Funny
    I mean really, discovering the perfect toilet paper algorithm seems all well and good, but I fear the consequence will be that people start to disregard the 'you empty it, you replace it' rule. Good usability does not require that the user be shielded from the process. Rather, the user should be well aware that, once a role is emptied, it needs to be replaced. If the issue is that guests mess up the system, I suggest hanging out with a smarter group of friends.

    Disclaimer: This post was written deliberately in the long-practiced computer science tradition of over-analyzing simple problems.

    --
    ___
    Cogito cogito, ergo cogito sum.
    1. Re:Usability a curse.. by bobtheprophet · · Score: 1

      If people start to disregard the "you empty it, you replace it" rule, who knows how destabilized society as a whole may become! Is it really worth the risk to analyze toilet paper replacement? We must not allow technology to become a threat!

      --
      Don't give me none of this "nature theme" business.
    2. Re:Usability a curse.. by Valar · · Score: 1

      I fear that this algorithm well use up valuble CPU time that could be used to find the cure for cancer, or read the CIA's email.

    3. Re:Usability a curse.. by Froze · · Score: 1

      You have obviously never lived in a house with children. They will immediately get around the rule you empty it, you replace by simply leaving a miniscule amount of whatever the rule applies to, thereby leaving the next person in the original predicament, since in most cases and this one in particular, to little is definately not enough!

      --
      -- The morphemes of your disquisition are ascertainable, but they have eschewed an ambit of transpicuous exposition.
  20. Cornholio! by Anonymous Coward · · Score: 0

    I need TP, TP for my bunghole. For there is only but on bunghole. The Almighty Bunghole. My people, we have only one bunghole. I wouldn't want my bungholio to get polio!

  21. Obvious complete solution: Don't wipe, wash. by strredwolf · · Score: 3, Informative

    The Japaneze have built several toilets which, when you're done answering nature's call, you reach on one side of the bowl where controls are. There you can clean your butt by having warm watter sprayed around the exit area, maybe some soap, rinse, and then blow dry.

    Don't forget to flush! :D

    --

    --
    # Canmephians for a better Linux Kernel
    $Stalag99{"URL"}="http://stalag99.net";
    1. Re:Obvious complete solution: Don't wipe, wash. by phaxkolumbo · · Score: 2, Informative

      If i had a toilet like that, i'd never leave the bathroom!

      But really, see this for more about washing toilets

      And take part in the bathroom behaviour survey to feel normal again.

    2. Re:Obvious complete solution: Don't wipe, wash. by Tablizer · · Score: 2

      (* ...the exit area, maybe some soap, rinse, and then blow dry. *)

      Blow-dry? Is that because they don't bother to wipe it dry, or does it serve some style purpose for some odd cultural event that I don't wish to hear about?

      Besides, woudn't blowdry give you a poofy Afro down there? (Not that there is anything wrong with Afro's, but I am not sure that is where you would want it.)

    3. Re:Obvious complete solution: Don't wipe, wash. by big+tex · · Score: 2, Interesting

      So, do they have a UPS on the toilet so they can drop a deuce while the power is out?

      Paper always works. Besides, it's good for starting fires. :)

      --
      I think I need a new sig here.
    4. Re:Obvious complete solution: Don't wipe, wash. by dimator · · Score: 2

      Wow. See, this is one of the many reasons why I love Japanese culture. I wish it was easier to learn the language so I could move there.

      --
      python -c "x='python -c %sx=%s; print x%%(chr(34),repr(x),chr(34))%s'; print x%(chr(34),repr(x),chr(34))"
    5. Re:Obvious complete solution: Don't wipe, wash. by Anonymous Coward · · Score: 0

      be sure and take LOTS of money with you if you go...you'll need it.....ALL of it
      oh, and i hope you dont mind living in a closet

    6. Re:Obvious complete solution: Don't wipe, wash. by hbackert · · Score: 1

      I have never seen a toilet which does not include paper as an option. There are many people who do not like this watering.

      So you always have the backup in form of old fashioned paper. Like we do in our office: print out all documentations on paper, so in case the server does not work...but that's a different problem.

    7. Re:Obvious complete solution: Don't wipe, wash. by shadow303 · · Score: 1

      You shouldn't have that much hair there. Clearly, your barber isn't fulfilling all of his duties.

      --
      I've got a mind like a steel trap - it's got an animal's foot stuck in it.
    8. Re:Obvious complete solution: Don't wipe, wash. by Anonymous Coward · · Score: 0

      You sound like a disgusting pig.

  22. Wow. by EggplantMan · · Score: 1

    I thought they always told you not to force it.

    --

    ?-|||-----x<*))))><
  23. The problem is not the toilet paper by Anonymous Coward · · Score: 0

    The problem with this is the tp holder. It has a mechanism that you need to squeeze in and pull out. It's clumsy and inefficient. I built one that slides in from the front. When the roll is done, you pull it straight out and replace the roll.

    1. Re:The problem is not the toilet paper by Tablizer · · Score: 3

      I would like to see one where you push a button to get the number of sheets. For example, there might be a 1, 2, and 3 button. Pushing a given button twice means that you get double that number. So, if you want 4 sheets, you push 2 twice.

      Then again, I don't know what the prior person left on the button. Thus, maybe a foot peddle press for each sheet.

      Also, why are the flush mechanisms so fragile? It seems every house and appartment I have ever lived in had problems with the flushing and fill mechanisms. They always leak, or get tangled up in odd ways, or settings drift over time, etc. Is QA bad? Or is it just a hard engineering problem to solve? Any craptologists out there?

      Perhaps it is time for Digital Toilets. But, I don't want to know what happens during extended blackouts (which I have been in) or dead batteries.

      I guess we are just stuck with crappy crappers.

    2. Re:The problem is not the toilet paper by Tablizer · · Score: 2

      Perhaps it is time for Digital Toilets

      I already put my "Intel Inside" sticker on the bowl.

    3. Re:The problem is not the toilet paper by jamesneal · · Score: 1

      Perhaps it is time for Digital Toilets. But, I don't want to know what happens during extended blackouts (which I have been in) or dead batteries.

      Hey, no reason that it has to use an external power supply. A micro hydroelectric generator isn't a large thing, and the water pressure in an average American household has enough energy to produce several hundred watts.

      -James

    4. Re:The problem is not the toilet paper by McCart42 · · Score: 1

      Origin of the word "crapper": From Thomas Crapper, an Englishman, who developed and manufactured the modern toilet bowl, which was used by US soldiers in World War I and brought the word "crapper" back to America. His biography was entitled "Flushed with Pride".

      --
      "I may be quite wrong." - Socrates
    5. Re:The problem is not the toilet paper by Tablizer · · Score: 2

      (* Hey, no reason that it has to use an external power supply. A micro hydroelectric generator isn't a large thing, *)

      Yeah, but that is Yet More Moving Parts to go wrong. Conceptually toilet fillers are simple: The water level pushes up some kind of lever and at a certain point (height) the lever closes the water flow to shut off the refill, stopping all activity. However, there are more things to go wrong than there are parts, it seems. If simple stuff breaks, then a generator and power storage etc. are just gonna make it worse.

      Is it gonna look like a car engine under there one of these days?

    6. Re:The problem is not the toilet paper by Tablizer · · Score: 2

      (* Origin of the word "crapper": From Thomas Crapper, an Englishman, who developed and manufactured the modern toilet bowl, which was used by US soldiers in World War I and...*)

      The person who told me the story got it all mixed up. The Englishman was named "Thomas Shitthead" in the story I heard :-)

      If his name was "Thomas Smith", would we be saying, "You are full of smith!" instead?

    7. Re:The problem is not the toilet paper by Have+Blue · · Score: 2
      Perhaps it is time for Digital Toilets. But, I don't want to know what happens during extended blackouts (which I have been in) or dead batteries.
      Or a BSOD.

      Or a DOS attack.
  24. I Read His Site by newt_sd · · Score: 1

    He has some interesting common sense solutions to today's problems I wish companies thought like he did

    --
    ***I GOT NUTHIN***
  25. commercial roll holders by Anonymous Coward · · Score: 0

    i was just thinking about this last week, and the fact is, that commercial roll holders blow chunks. in trying to enforce some failed engineers design for roll use, they actually prevent you from getting any toilet paper at all. well, without getting one shredded square at a time.

    the basic home roll, at least dispenses the required amount of paper. while i totally agree with the essay, youd think in doing the second thing, theyd get the first thing right first.

    commercial roll holders suck, thats why people pee on them.

  26. Looks like the webmaster of Twin Supply reads /... by mbourgon · · Score: 3, Interesting

    Decided to take a look, see what kind of dual-roll dispensers are available, and voila... a sale!

    Don't know if it was deliberate or not, but what a great way to utilitze the Slashdot Effect...

    --
    "Sometimes a woman is a kind of religion, she can save your soul & set you free from all your sins" - Bad Examples
  27. No benefit by Anonymous Coward · · Score: 1, Insightful

    By using a smallest algorithm you get no benefit over random or largest, except for the option of negating the purpose of dual rolls. With smallest you can refill either after one roll is out or after both rolls are out. If you do it after one roll is done, you've lost all benefit of a dual roll setup: you still have to refill after each single roll and because there is no discernable difference between two fully (or nearly) stocked rolls the one you start using will be the one you keep using. The second roll doesn't even get a chance.

    If you choose to refill after two rolls you end up with no gain over random or largest since you have to refill two at a time no matter what.

    Conclusion: there is no best way to deal with a two roll setup. The advantage conferred is just that you don't have to refill for twice as long if you choose. If you want to refill at the same interval as a single, stick with a single.

    1. Re:No benefit by Anonymous Coward · · Score: 0

      actually thats sortof correct.

      its like having two half rolls hanging side by side, what difference does this make, its just an arbitrary point between two half rolls. or between a roll twice as large.

      i guess the point is that the humans notice this arbitrary point. but this could be achieved by a message halfway saying change roll now. but then youd waste half a roll, so i guess you need somewhere to put this, hence the second roll holder. it allows a change from one roll to the other without there ever being no toilet paper.

      which is the point, never being stuck paperless. i cant help but feel that you could walk into the bathroom and use one roll, and the other one has been sitting unrefilled for the past week. twice as annoying.

    2. Re:No benefit by Migrant+Programmer · · Score: 1

      The benefit is that you don't have to refill it at a, shall we say, inconvenient time. If there is always one usable roll, the second can be refilled without having to hunt for a roll in a cabinet during said inconvenient time.

  28. Over the top or out from the bottom by SiliconEntity · · Score: 5, Funny

    The article does a good job of analyzing which roll to choose, but neglects the most important question of installing toilet paper rolls.

    Should the paper come over the top of the roll, or out from under the bottom?

    Clearly, over the top is better, because no matter how long or short the loose end is, it is always on the front so you can find it. With the under the bottom system, the loose end can be hanging behind the roll and you have to roll it until you can grab it.

    1. Re:Over the top or out from the bottom by Anonymous Coward · · Score: 0

      I'm an "over the top" person myself, but those people I know that are (regrettably) cat owners make the good case that the "bottom" configuration is more cat-proof when it comes to having the entire thing unrolled.

    2. Re:Over the top or out from the bottom by jjsjeff · · Score: 1

      I have to disagree with you...

      I always install the roll so that the paper comes out from under the roll. My reasoning for doing this is so that if I pull too much out then all I have to do is push the outside down and the roll rolls the paper back to the proper level.

      I do believe, however, that proper "ettiquite" would dictate that the paper should come from the top of the roll rather than the bottom of the roll. At least when I checked several of my friends' bathrooms it was usually like that.

    3. Re:Over the top or out from the bottom by Anonymous Coward · · Score: 0
      "toilet paper hung in improper overhand fashion..."

      Simpsons. All knowledge comes from The Simpsons.

    4. Re:Over the top or out from the bottom by handsomepete · · Score: 1

      As always, The Simpsons has all the answers. To be extra dorky, I looked up the episode on snpp.com to confirm:

      [Episode 3F01] Home Sweet Home- Diddily- Dum- Doodily
      The child welfare people that come to take the Simpsons children away lists one of the offenses against Homer and Marge as 'toilet paper hung in improper overhand fashion.'

      Hey, if it's enough to get your children taken away, that's good enough for me.

    5. Re:Over the top or out from the bottom by SilentTristero · · Score: 2, Funny

      This was all decided on Usenet in the mid-80s, back when Usenet was a real community.

      And yes, over the top is the right answer, unless you are a cat owner.

    6. Re:Over the top or out from the bottom by Grond · · Score: 4, Funny
      Should the paper come over the top of the roll, or out from under the bottom?


      There was a slashdot poll about this a long, long time ago (about the time I started reading slashdot, in fact...heh, even then there were people whining about how "slashdot had changed" and "we never have cool polls anymore...like that one about the toilet paper").

      Ahh, here it is. The winner with 60% of 13401 votes is "Over". Under got 12%, 18% didn't care, and 8% answered "Huh?" I guess the "Huh?" group lives/lived in societies that don't use toilet paper (either because they use bidets or just go without...)
    7. Re:Over the top or out from the bottom by DrPsycho · · Score: 1
      If you have any pets (or small children) who might grab at the roll, then the under-from-the-bottom method is clearly superior.

      I've seen cats get hold of the roll and start spinning... they always spin the front portion downward. With the loose sheet coming out the back, they're spinning against the flow of the roll... you don't end up with a pile o' toilet paper on the floor.

      Of course, if you don't have the above concern, then the arguement loses any sort of merit, but there you go.

      --

      -DrPsycho - Coping with reality since 1975

    8. Re:Over the top or out from the bottom by Colz+Grigor · · Score: 2
      Only to add confusion to this issue, I would like to add that no matter how you put the toilet paper on the dispenser, the toilet paper is always over the top.

      It's just a question of whether it's over the top loose end toward you or over the top loose end away from you.

      Perspective.

      And I believe over the top loose end toward is correct.

      ::Colz Grigor

    9. Re:Over the top or out from the bottom by cromano · · Score: 1

      Though neither combination is toddler-proof!

      Life is tough.

    10. Re:Over the top or out from the bottom by 3ryon · · Score: 5, Funny

      Clearly, over the top is better, because no matter how long or short the loose end is, it is always on the front so you can find it. With the under the bottom system, the loose end can be hanging behind the roll and you have to roll it until you can grab it.

      I think a lot of people feel this way...until they have cats.

    11. Re:Over the top or out from the bottom by Anonymous Coward · · Score: 0

      Hmm, guess this is a lot off-topic, but I'm a big fan of the sig... In case somebody is reading this and doesn't know German, it says, roughly "He who fights with monsters must become a monster himself." Way to go with the correct choice of Nietzsche.

    12. Re:Over the top or out from the bottom by rgmoore · · Score: 4, Insightful
      Should the paper come over the top of the roll, or out from under the bottom?

      Clearly, over the top is better, because no matter how long or short the loose end is, it is always on the front so you can find it. With the under the bottom system, the loose end can be hanging behind the roll and you have to roll it until you can grab it.

      That depends on the number of small children and pets in the household. If you make the free end of the toilet paper too easy to grab, then the simple minded and easily amused (I guess that might include some adults too) will sit there and unroll the whole roll just for the fun of it. It's like many things involving children and pets: making things too convenient can wind up causing problems when those who shouldn't be messing with things have access.

      --

      There's no point in questioning authority if you aren't going to listen to the answers.

    13. Re:Over the top or out from the bottom by Anonymous+Shepard · · Score: 1

      Not quite. It's rather something like: "... must be careful that he does not himself become a monster." (Although I'm sure there is a better translation somewhere.)

      --
      I have a life. I really do. I've just chosen to ignore it.
    14. Re:Over the top or out from the bottom by pr0nbot · · Score: 1

      Over the top. If you do it the other way, your hand will scuff the wall which, over time, results in a stain on the wall.

    15. Re:Over the top or out from the bottom by kyhwana · · Score: 1

      That's the advantage of the two rolls system.
      You can have one roll over the top, and the other from under the bottom!

      --
      My email addy? should be easy enough.
    16. Re:Over the top or out from the bottom by timeOday · · Score: 1

      This important question does have an answer. Note that pleated or printed TP has a 'front' and a 'back.' If you feed the paper from under the bottom,the decoration faces the wall. Therefore, the TP artists, engineers, and designers clearly intended for paper to be fed over the top.

    17. Re:Over the top or out from the bottom by Anonymous Coward · · Score: 0
      I think a lot of people feel this way...until they have cats.


      And putting it in backwards doesn't stop 'em. Trust me, I've tried.

    18. Re:Over the top or out from the bottom by Art+Tatum · · Score: 2
      I think a lot of people feel this way...until they have cats.

      True enough. But then, the kind of people who would own a cat deserve it. :-)

    19. Re:Over the top or out from the bottom by gorf · · Score: 2

      ...those who shouldn't be messing with things have access.

      Have you tried putting an ACL on your toilet roll holder? :-P

    20. Re:Over the top or out from the bottom by richie2000 · · Score: 2
      But... But... There's no CowboyNeal option! This is an outrage! I demand an immediate senate hearing!

      On a side note, the phrase "out from the bottom" is oddly appropriate for this discussion, not to mention "over the top".

      --
      Money for nothing, pix for free
  29. This is complicated? by Anonymous Coward · · Score: 0

    Anyone who took more than five seconds to realize Algorithm Small was the solution should not be allowed to post on slashdot. OK, I'll allow 30 seconds, to accommodate diversity among the readership, but that's it.

  30. Our mothers and Ren Hoek understood the algorithm. by BitwizeGHC · · Score: 2

    "Get your hands out of that cereal box! How many times have I told you never to open a new box until you've finished the last box?"

    --
    N4st0r, trixx0r h0bb1tz0rz! Th3y st0l3 0ur pr3c10uzz!
  31. Another tax dollar saved. by halftrack · · Score: 2

    Members of the world. Fear no longer. The toilet paper issue is solved, once and for all. No nitwick professor can now waste you're hard earned tax money on this essentially small problem. I am glad it was solved by man-in-the-street.

    --
    Look a monkey!
  32. Don Knuth wrote a paper about it! by null-und-eins · · Score: 2, Informative

    Believe it or not, Donald Knuth has a paper "The Toilet Paper Problem" in his book Selected Papers on Analysis of Algorithms (ISBN 1575862123).

    --
    At the beginning was at.
    1. Re:Don Knuth wrote a paper about it! by null-und-eins · · Score: 2, Informative

      The following PDF reviews the book and mentions explicitly the problem and its solution.

      http://www.cs.umd.edu/~gasarch/bookrev/32-1.pdf

      --
      At the beginning was at.
  33. Dorks Anonymous Meeting by Noexit · · Score: 1

    "Hi, my name is Don, and I have too much free time on my hands."

    --

    Never argue with a man carrying a water buffalo

  34. umm by Anonymous Coward · · Score: 0

    this guy either has too much free time and/or is psycotic..

    1. Re:umm by Anonymous Coward · · Score: 0

      I have too much free time on my hands! But all I do is smoke crack.

  35. Maka quick buck by Tablizer · · Score: 3, Funny

    If you want to make a fast buck, go the the hardware store, buy a bunch of sand-paper, and resell it at a Trekkie convention as Official Klingon Toilet Paper. (You might need to print up some fancy-looking packaging.)

    Sells like hot cakes.

    I just don't like to be around when they test it on a dare.

  36. You missed the point by Anonymous Coward · · Score: 0

    The problem they're trying to solve is that of running out of paper before you're done wiping. Get it?

    This is not an uncommon problem, and having two rolls solves this problem if you always use the smaller roll first, as the article describes. If it runs out before you're done, it's no problem because you've still got the other roll. Then you can replace the empty one at your convience.

  37. The halting problem... by tlambert · · Score: 3, Funny

    The author discussed, in true binary fashion, "available" vs. "unavailable" for a second roll.

    People have also discussed "over the top vs. under the bottom".

    There is a middle ground: two rollers, one "over the top" and the other "under the bottom". This would also self-regulate the usage of the rolls, ensuring one ran out before the other.

    Which one runs out first depends on the physical characteristics of the holder.

    For a fixed holder, the answer is probably "over the top".

    But for a hanging holder, where the weight of the paper itself levers the paper into the wall, increasing the overall friction, "under the bottom" allows you to mitigate friction effects, while "over the top" increases them.

    Since a fixed holder results in the choice being user preference, that doesn't solve anything; clearly, the fix is in two parts: (1) use hanging holders, and (2) make the primary roll "under the bottom" and the secondary roll "over the top".

    Another solution (which is only statistical) is to locate rolls on either side of the toilet. Left handed people are outnumbered by right handed people 20 to 1, on average. But this fix only works "on average", as a result.

    All in all, a "P-P complete" problem.

    -- Terry

    1. Re:The halting problem... by JazMuadDib · · Score: 1

      Wouldn't it be more accurate to say it's a "T-P Complete" problem?

    2. Re:The halting problem... by Jump · · Score: 1

      I think this solution is genius. I will
      suggest you to the Nobel Prize committee!
      In the meantime, please publish your results in
      the Journal of Engineered Toilette Science (J.E.T.S.).

  38. Not exactly a new idea by jc42 · · Score: 3, Interesting

    This is one of the textbook examples of what people in several fields (such as economics evolutionary biology) have for some time referred to as "super-rational" behavior.

    Th conventional definition of "super-rational" is taking into account the consequences of everyone (or at least the majority) following the strategy. It doesn't actually imply that the actors are rational (or even thinking). One of the topics where it has been used is the biological question of how altruism evolves. The best explanation so far is that a population that behaves altruistically among themselves has a survival advantage over purely individualistic populations.

    The double toilet paper example is used as a clear way of illustrating this concept, in a way that doesn't impinge on people's social or religious ideologies. Very few people have any strong feelings about which roll you should use, so they are able to follow the argument without their beliefs causing distraction. And it's clear that a population could behave in a super-rational fashion in this case without being consciously aware that they were doing so. An irrational preference for the inner part of the roll would suffice.

    If you ask google about "super-rational", you'll find a number of links to this concept buried among the silly and/or pretentious sites.

    --
    Those who do study history are doomed to stand helplessly by while everyone else repeats it.
  39. The "Guru" get's it wrong, then iterates by RZeno · · Score: 1

    we purchased holder of two rolls, side by side. We discovered that although we now had two rolls instead of one, the problem was not solved.

    It's disturbing to see "The Guru of Workable Technology" was unable to identify a correct solution to the problem before he purchased and used the product...

    Luckily the "guru" was eventually able to identify and correct the problem, then share the experience with us all! (Don't you think a "guru" would have better things to write about?)

  40. Paredo-optimal solution by tlambert · · Score: 2

    It occurs to me that there *is* a paredo optimal solution.

    There has to be.

    The problem is "P-P complete".

    -- Terry

  41. Take the Survey! by xintegerx · · Score: 1

    Do you "double-dip"?

    Are you a "perfectionist" or an "inspector"?

    Take the Bathroom Habits Study here


    ...Also, you can WinToiletPaper.Com

    (An error occured processing this directive.)

    1. Re:Take the Survey! by LegendLength · · Score: 1

      And if you think the trolls here put in a lot of time, check the comments section on that first site.

  42. Or, how about the no toilet method? by The_Shadows · · Score: 1

    At my home on campus, they are installing new showers. To do this, they needed to turn off the water. It's been off since Wednesday, and will likely be off until Monday or Tuesday. Talk about disgusting. We've been running out to Wal-Mart and buying gallons of water so we can flush the toilets. It wouldn't be that bad, but one of the guys in the house must have some major problems, because he has to go #2 a lot. And they smell real, real bad.

    Toilet paper is the least of concerns.

  43. Alas by khendron · · Score: 1

    At my work they have installed the commercial type where pushing down on the emtpy roll drops the next roll into place.

    Alas, invariably the next roll gets dropped into place before the first roll is complete. You end up with two touching rolls, one on to of the other, both of which are hard to turn.

    As for the "over or under" question that is not addressed in the article but many people seem to be discussing, most people with cats would prefer the under approach. The over approach is far too easy for my cats to unravel, leading to the bathroom being turned into a toilet paper playhouse while I am away. At least the under approach makes them think a little (something they prefer to avoid).

    --
    Life is like a web application. Sometime you need cookies just to get by.
  44. under is easier to tear one-handed by Crag · · Score: 5, Funny

    One can catch the paper against the roller holder and get more friction making tearing easier when the roll is installed "backwords". If you try to do this with a forwards roll you'll have to loop what you've got up and around, which tends to get complicated when one is focussed on the latest issue of Popular Mechanics... or whatever else one might read on the toilet... one-handed.

    1. Re:under is easier to tear one-handed by Ryan+Amos · · Score: 2

      Popular Mechanics? Only if they're reviewing the RealDoll.

  45. Well the bright side is.... by MrByte420 · · Score: 1

    At least it looks as if the toliet paper problem is defintely in P. Human beings could be doomed to a lifetime of misery should the problem had been intractable.

    --
    If religous zealots don't believe in Evolution, then why are they so worried about bird flu?
  46. Bullshit, er, whatever... by vsprintf · · Score: 1

    By using a smallest algorithm you get no benefit over random or largest, except for the option of negating the purpose of dual rolls.

    I normally don't get into the scatalogical stuff, but the above asumption is wrong for places where the people using the article are not the ones who replace the article.

    I work in a place where the men's restroom in the software section (can't vouch for the women's restroom) has 3 stalls, two have the "forcing function" dispensers, and one has the dual roll dispenser.

    The "forcing function" dispensers have long since been severely damaged as a result of (I'm assuming) lack of fulfillment during a moment of need.

    The rolls in the recently installed "dual roll" stall were initially subject to the algorithm large. Once the sight of two nearly empty rolls greeted the visitors, the popular usage quickly became algorithm small.

  47. The rest of his Site by BFedRec · · Score: 1

    I've not wasted a couple hours yet, but the Essays I have read are quite insightful... I'm especially fond of the one titled "in defense of cheating". My wife has her degree in education and is homeschooling my 5 year old son, I'm going to have her read them and give me an educator's perspective on them. I think that the concepts are more intended for a higher education but I'm curious if she will come up with methods for implimenting them into an early childhood classrom. His assertions of attractive things working better and his corresponding defenses are very interesting as well.

  48. Algorithm of TP by Twintop · · Score: 1

    $a=$rolls[0]; $b=$rolls[1]; if ($a $a) { use Toilet::RollA; } elsif ($a = $b) { int(rand(2)); } if ($a eq 0 && $b eq 0 && $USER{'diarrhea'}) { die "Crap!"; }

    1. Re:Algorithm of TP by Twintop · · Score: 1

      Argh...stupid formatting cut out part of it...

  49. The Grand Challenge(s) by Lucas+Membrane · · Score: 1
    This is among the ten hardest computing problems to be solved by computers before the year 3000: Given a roll of toilet paper, deduce what was written on the paper that was recycled to make that toilet paper.

    Here's a good teamwork exercise/competition for management training classes: Given two adjacent porceline bowls in a restroom of a large building and two rolls of toilet paper, unroll the two rolls or toilet paper completely on parallel paths starting at each toilet, running out the door of the restroom and through the halls of the building. Each team of 5-10 people gets one strand of TP and the corresponding toilet. The team that can flush its roll entirely down its toilet first without severing it wins. This demonstrates that the role of management is (a) coordinating work, (b) moving paper, (c) making people rush, and (d) moving unpleasant pieces of paper rapidly to a place where no one can find them.

    Why do they call it a crapper and not a crappee?

  50. T'is Solved (with one colour illistration) by femto · · Score: 1
    What happened to that time honoured domestic engineering solution: the crochet toilet roll holder on top of the cistern?

    Alternatively, there is the squares of newspaper hanging off the nail. Cheaper and you can refill it when it is half used!

  51. the issue isnt quantity, its direction. by MERVERNATOR · · Score: 1

    I dont care when the paper tube is full or empty,.. I just want to be able to spin it and get my paper.... but the age old conflict is really the hanging direction. I posted a poll about this back in 9/2000 Go Vote!

  52. Easy solution. by DarkHelmet · · Score: 2
    Why don't you just have a little LED on top of the two rolls that points to which roll you *should* use. When the TP on one roll goes low, you switch it to the other side.

    Oh, I'm sorry, that's for EE majors, not CS people.

    --
    /^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$/i
  53. Another Paradox by Lucas+Membrane · · Score: 1

    Assuming that the average time in the restroom is 1 minute for men and five minutes for women. Given that an airplane or restaurant has two toilets. If these are changed from accessible to either sex to sex-distinct, then the average wait for men is reduced about 80% but for women increased about 100%, so it is a net loss. However, if these are changed from sex-distinct to accessible to either sex, then the average wait for men is increased about 400% and for women it is decreased only 50%, so it is also a net loss. The net net result is that nothing can be changed, and the tyranny of the status quo prevails.

  54. I count three... by Skreech · · Score: 1

    Soap. Rinse. Dry. The three seashells? Must be.

  55. Forcing function unnecessary? by Colz+Grigor · · Score: 2
    It has been addressed as humor in response to this essay, however I think it an interesting point...

    Perhaps the answer has something to do with whether the paper is dispensed over the top toward the front or over the top toward the back.

    This puts in question the author's premise in the first place. He states there are three possible functions for the use of toilet paper.
    Algorithm large
    Algorithm small
    Algorithm random

    Perhaps, even before these algorithms are addressed, the directionality of the toilet paper is of ultimate concern.

    This is to say that the author's algorithms might be correct if both rolls of toilet paper are equal, but the purpose of the forcing function is to make the rolls of toilet paper unequal.

    So I ask: what would happen if, on a dual roll of toilet paper, the closer roll was over the top toward the user and the further roll was over the top and away. This would make the first roll more accessable and therefore might possibly resolve the whole issue.

    And I'm not even a computer scientist!

    ::Colz Grigor

    1. Re:Forcing function unnecessary? by Colz+Grigor · · Score: 2
      Sent a similar message to the author, Don Norman. Received this reply:

      Thanks for writing.

      My house is tainted by the essay and the discussions we have had.

      So I'll let you do the experiment.

      Good luck.

      Thanks for writing

      Okay, fine.

      I went to work today, where we have dual side-by-side dispensers. I noticed that in one of the stalls, the paper was precisely as I suggested it should be for this experiment but reversed: the closer roll was over to the back while the further roll was over to the front.

      Interestingly enough, the further roll was nearly empty and the closer roll was nearly full.

      So there's data point #1, confirming my theory. Can anyone else add data points?

      ::Colz Grigor

  56. At First Glance... by limekiller4 · · Score: 3, Funny

    Oh, man. When I read "forcing function," I was going to suggest more fiber, but this is a bit different...

    --
    My .02,
    Limekiller
    1. Re:At First Glance... by ivrcti · · Score: 1

      Thanks for the laugh!! "Wheaties" not just the breakfast of champions!

  57. reminds me of an old joke by wrinkledshirt · · Score: 1

    With the button called "ATR" for (Automatic Tampon Removal) and a guy who accidentally takes care of business in the women's washroom...

    --

    --------
    Bleah! Heh heh heh... BLEAH BLEAH!!! Ha ha ha ha...

  58. Don Norman by teetam · · Score: 3
    Don Norman is an excellent computer scientist who concentrates on the usability aspect of software which many ignore. His book - "Design of Everyday Things" is a very interesting book and a must read for all techies.

    There is more to computer science than mastering the latest buzz words.

    --
    All your favorite sites in one place!
  59. Direction by mike3k · · Score: 2, Insightful

    If you have a cat, the roll needs to face towards the wall, or you'll find it unrolled and most of your home TPd. On the other hand, my can is now able to unroll it in either direction.

  60. shit by Anonymous Coward · · Score: 0

    I think this is a pretty shitty topic. Killing time until 20 seconds elapses, yeah, what a stupid rule, 20 seconds, ok, come on.... there we go....

  61. Cisco IOS includes a solution by mcice · · Score: 1

    Engineers at Cisco Systems have known about this problem for a long time. Being in the field more often then at home, they came up with WRED, weighted random early drop. This method has enabled them to reduce buying toilet paper for their own home use to a very manageable small number of times a year. Clever.

  62. This is "the next step"... by tcc · · Score: 1, Flamebait

    Ex DEC Alpha people -> AMD Hammer engineers
    Ex Amiga people -> Newtek, scala, etc..
    Ex SGI -> NVIDIA

    etc etc..

    Ex-Apple -> Toilet paper algo. research.

    I rest my case :)

    --
    --- Metamoderating abusive downgraders since my 300th post.
    1. Re:This is "the next step"... by gnu-sucks · · Score: 1

      AMD Hammer users: none, not out yet Newtek scala users: no idea, never heard of it nVidia users: probably about 1 million Toilet paper users: +4 billion I rest *my* case :)

  63. easy solution by SlugLord · · Score: 1

    ok, so every non-cat-owner knows that "over the top" is easier to use. Simply make rotating roll holders. Have one roll "over the top" and one the opposite. Then, when the over the top roll runs out (which will almost certainly be sooner than the "under the bottom" roll), simply rotate the under the bottom roll so it's over the top. Then, when the person who used the last of the roll replaces it (and he had better), he must simply place the new roll in an under the bottom orientation.

    One needn't force the correct usage. Often making the preferred choice more attractive will suffice.

  64. Keep It Short and Simple, anyone? by jkramar · · Score: 1
    A single roll, however commonplace, is, well, shall I say, awkward. When the roll empties, then what? As a result, whenever we saw the roll approaching exhaustion, we would place a new roll either on the floor beside the toilet or on top of the toilet tank. In either case, we were defeating the nice orderly arrangement of the facility. Wouldn't it be far better to have a place to put the roll?

    This is the centre of the problem; all of the other BS (sorry, I just had to play that card; what I meant was overcomplicated speculation) veers off and becomes a bit irrelevant, as the only thing sought is a holder for the next roll of toilet paper. However, it is not to be used until the current roll is empty. What could be simpler than to create a cylindrical container in which to put the next roll? It would be inaccessible for use but ready to bring out and replace the old.
    --

    true && more || less
  65. Chindogu by colonelteddy · · Score: 1

    Why bother wearing a toilet roll on your head? Simply take it to it's natural conclusion - Nappies.

    Sure, you could always carry a toilet around in your pants, but thats not really practical, is it?

    But really, as children, (unless we go by Homer Simpsons method of letting them run around free in the garden and let nature take its course) we wear nappies, (Diapers, whatever)
    As senior citizens, embarassing deterioration of our internal organs may drive us to take similar action.

    So why in the middle must we train ourselves to go against what we learnt as babies, only to go back to it when elderly?

    Add the fact that we sleep for roughly one third of our lives, and during the period of our lives when we aren't in nappies we can usually control our bodily functions to avoid accidents while asleep.
    So, in effect, time on/at the toilet makes up a miniscule amount of our lives, yet it takes a lot of time in getting to and from the toilet, not to mention buying and using toilet paper, and washing hands.
    Why go through all this bother? Save space in your house! Save time! Save water! Wear a nappy today!


    A paid comment brought to you by the Nappy Makers association of Australia

    --
    c - a blessed +5 grain of salt
  66. Preventive Maintenance by Guppy · · Score: 2

    "Also, why are the flush mechanisms so fragile? It seems every house and appartment I have ever lived in had problems with the flushing and fill mechanisms."

    When was the last time you remember seeing anyone do *preventive* maintenance on a toilet? It's not something people want to think about. So when things don't work quite right we just ignore it or jiggle the handle while it slowly gets worse and worse until it finally breaks.

    BTW, I had to fix one a little while ago, and according to a do-it-yourself book, the most common point of failure is in rubber parts (especially the flapper valve) which degrade and must be periodically replaced. You can get more expensive synthetic ones that will last longer, but over time even those can suffer from deformation that will degrade the seal.

  67. Wrong CS. Should be "Common Sense." by stickb0y · · Score: 1
    Yikes. We never realized that you had to be a computer scientist to use toilet paper. Worse, we didn't realize that thinking was required to select the roll.

    No offense to Don Norman, but come on, this is stretching it. When the goal is to ensure that one roll of toilet tissue is exhausted before the other, then it seems pretty obvious to me: finish one roll before starting the other. Duh. Anything that uses both is going to increase the likelihood that both run out at the same time.

    You don't need to have a computer science degree to figure this out; you just need common sense.

    In fact, thinking like a computer scientist might be what caused him incorrectly to consider a random algorithm in the first place.

  68. Toilet paper? by Anonymous Coward · · Score: 0

    Toilet paper? You guys actually wipe after pooping? I kinda enjoy the slippery, squishy feeling from leaving the klingons attached, especially when I've eaten a lot of greasy foods earlier, I'm wearing pants and it's a really hot day. And the aroma! Great googly-moogly!

  69. Political Metaphor by Critter · · Score: 1

    Hmm. I find this analysis to be metaphorical of the
    American two-party political process. Dispite
    Kennedy's famous assertion, people join political
    parties not for what they can give the party, but
    what the party can give them. Like the toilet paper
    dilema we subconsciously choose the "bigger roll",
    as it were, because that party has "more" to offer.
    We are oblivious to normative rate of decay in the
    system because our initial strategy is a subconscious
    one.

    Write 3000 words on the subject. :-)

  70. Euphanisms by Snover · · Score: 1

    Where have you been living? It's no longer called "toilet paper" -- it's now "toilet tissue!" My god, you people are so uncultured it's a wonder you don't spend all your time in front of a computer screen talking to people over some magical worldwide web.

    --

    [insert witty comment here]
  71. a somewhat inconsequential topic to everyday life by oggodog · · Score: 1

    not

  72. Re:Wrong CS. Should be "Common Sense." by lanalyst · · Score: 1

    An episode of the old Fox series 'Married with Children' had Al Bundy installing his own bathroon in the basement so he wouldn't have to share with the rest of the family. After going through a quest to find the right crapper, one with the most 'satisfying flush', he proudly mounted 4 TP dispensers on the wall so he would never be without.

    I have to admit: I've come up with some pretty decent ideas in the bathroom and to have my thought process jarred by a missing roll of TP would be frustrating.

  73. tells you a lot about the state of HCI research by g4dget · · Score: 3, Interesting
    It should be pretty obvious to any halfway intelligent person how to use a dual-roll toilet holder. It does not require a computer scientist, a rocket scientist, or any other kind of scientist.

    Furthermore, most homes have something nice and pretty called a "under-sink cabinet" in the bathroom, which is where you keep the extra toilet rolls when you have a one-roll holder. It solves the problem of which roll to take paper from (the one in the holder, not the one out of sight in the cabinet, in case you are part of the few percent of the population that doesn't get this). And that is why most homes don't bother with ugly, bulky, industrial-looking dual-roll toilet holders. People who have a separate room for their toilet and no under-sink cabinets usually install a little cabinet in that room, useful not only for holding toilet paper but also cleaning supplies.

    Most normal people understand this. Most normal people know to look in the cabinet when they run out of toilet paper. (Most normal people also know not to keep any incriminating or unusual personal items there because they understand that other people will be looking there.)

    I think the fact that one of the foremost HCI experts in the countries thinks it worthwhile to share his profound insights on this matter tells you a lot more about the state of HCI research than anything about toilet paper. Apparently, HCI researchers think that the rest of the country consists of idiots who don't even know what to do in the bathroom. In different words, I think a lot of HCI research is roughly at the same level of worrying about installing dual-roll toilet paper holders in the home.

    1. Re:tells you a lot about the state of HCI research by cduffy · · Score: 2

      I disagree. The cabinet under the sink can be difficult to get to if you're already sitting on the pot and don't care to get up. Further, the availability of backup rolls is not readily visible, and may go undiscovered 'till it's too late.

      Hence, I'd argue that the article is both relevant and useful, as are dual toilet paper holders.

    2. Re:tells you a lot about the state of HCI research by g4dget · · Score: 2
      The cabinet under the sink can be difficult to get to if you're already sitting on the pot and don't care to get up.

      That's why you look before you sit down, another one of those simple lessons of life most people learn in kindergarden. If you haven't figured out to look first, dual rolls won't help you either.

      Further, the availability of backup rolls is not readily visible, and may go undiscovered 'till it's too late.

      Again, look first if necessary. If you forgot to look and there is nothing there (two failures), it is embarrassing enough for everybody involved not to repeat the mistake, and harmless enough not to lose sleep over.

    3. Re:tells you a lot about the state of HCI research by cduffy · · Score: 2

      You honestly go through that step every time? Jeesh.

      One of the points of good HCI design is to eliminate unnecessary work on the part of the user, and maximize tolerance for user-error. A good dual-roll system (which, among other things, makes its status clearly visible and allows plenty of time for replacement while only one roll is empty) makes it harder for the user to Do The Wrong Thing and makes proper usage more convenient (by extending the refilling window). As such, a good dual-roll design is truly an improvement over the more traditional system you argue in favor of.

    4. Re:tells you a lot about the state of HCI research by g4dget · · Score: 2
      You honestly go through that step every time? Jeesh.

      You mean, look at the roll holder before I sit down? Of course. Doing so is simple self-preservation in the real world.

      As such, a good dual-roll design is truly an improvement over the more traditional system you argue in favor of.

      I don't argue in favor or against it, I'm merely pointing out that for normal people, this is not a real problem. The fact that HCI researchers think it is a problem tells you a lot about HCI researchers.

      (Even if it were a real problem, the dual-roll design doesn't really fix things. If you don't look at it fairly regularly, you will still find yourself with your pants down and no paper. If you wanted to "protect" people from that situation, you'd have to lock the bowl itself when there is no paper, to force people to refill before they are caught with their pants down. This has obvious disadvantages in practice, but it is roughly the equivalent of what many modal dialog boxes do in real-world software.)

    5. Re:tells you a lot about the state of HCI research by cduffy · · Score: 2
      (Even if it were a real problem, the dual-roll design doesn't really fix things. If you don't look at it fairly regularly, you will still find yourself with your pants down and no paper.

      ...for a much, much looser definition of "fairly regularly" than is necessary with the traditional design. Anyhow, having the spare roll directly next to the current one makes it much more likely to be noticed when there's no ready spare than when the "spare" is sitting inside a closed cabinet drawer. It's not a sure thing, granted, but the result is to rather dramatically reduce instances of embarassment for even more absent-minded folks (like myself). That is to say: You may have substantially more presence of mind than many others, but that's not to say that a system that's usable for you is ideal for everyone. Changing an interface to increase usability by even a subset of the population is entirely reasonable so long as it doesn't substantially impact usability by the populace as a whole.

    6. Re:tells you a lot about the state of HCI research by g4dget · · Score: 2
      Changing an interface to increase usability by even a subset of the population is entirely reasonable so long as it doesn't substantially impact usability by the populace as a whole.

      I disagree. Cumulatively, accomodating all the possible excentricities and quirks of everybody results in overwhelming waste, costs, and functional limitations. And that is just what we see in user interfaces designed by HCI experts: bloated, annoying programs with very limited functionality.

      Furthermore, those accomodations don't help, they make things worse. If you don't learn to check for paper at home, you likely will forget when you travel as well, and then you are in real trouble. And if you come to rely on all those gadgets and gimmicks in one house, you'll have to buy them all again when you move.

      If you are disabled, by all means, go ahead and accomodate. But for laziness or stupidity, there is a very simple answer: you have one of the most powerful brains in the animal kingdom--use it.

    7. Re:tells you a lot about the state of HCI research by Zarf · · Score: 2

      most homes have something nice and pretty called a "under-sink cabinet" in the bathroom

      I live in Germany. We don't have cabinets. We have cute stuffed bunnies that look like toys but are really rolls of toilet paper dressed up as dolls. When you run out you reach up and rip the bunny's clothes off and tada! Toilet paper!

      BTW: We also don't have those tank thingies behind the toilet either... just giant ceramic buttons embedded in the wall.

      Oh yeah, and you flip the light switch up to turn off the light and down to turn on the light. Weird huh?

      --
      [signature]
    8. Re:tells you a lot about the state of HCI research by cduffy · · Score: 2

      If you are disabled, by all means, go ahead and accomodate. But for laziness or stupidity, there is a very simple answer: you have one of the most powerful brains in the animal kingdom--use it.

      You presume that the natural order of things is to have the exact same technology that we have presently -- that any changes or improvements to increase usability are "accomodations" incurring extra expense and difficulty. That's not necessarily the case -- if one is building a bathroom ground-up, the marginal expense in a proper dual-roll configuration is minimal -- and in any event, the primary thing keeping the older technology as standard (such that using anything better is an "accomodation") is the attitudes of people such as yourself. (Are modern bathrooms "accomodations" for people who don't like outhouses?)

      Would you have folks using only vi on their home machines, because there's no guarantee that vim or emacs will be available when they work on other hosts (and expecting the features of the latter editors will hamstring them when traveling)? Would you expect people to buy only vehicles with manual transmissions, because doing otherwise will hamstring them should they need to drive a stick?

      Finally, let me mention that while the cumulative effect of accomodating all possible ecentricities and quirks is indeed enormous, I don't argue in favor of doing so. Rather, when building or remodeling a home, I can choose to accomodate those eccentricities and quirks for which the benefit (either to myself or to my likely guests, or the home's future purchasers) outweighs the cost. If all decisions regarding such accomodations were made similarly, however large the costs involved might be, the cumulative benefits would be similarly great. A skilled HCI expert will be able to take this tradeoff into account, and develop interfaces that provide the most benefit to the most users with the least costs. Now, you (and I) are presumably not "most users", and may find the constraints applied to be unreasonable -- but for the average users, a good interface by a skilled HCI expert will result in a more immediately usable program with fewer "gotchas" resulting in user error. Granted, these users may still have the brains to (with substantial work and effort) learn to use a more arcane UI -- but why make them learn to use their computer with time they could be spending going about their work?

  74. A Toilet Paper Story by Anonymous Coward · · Score: 0

    Way back when I was a university student the department professor used to hold afternoon tea every Sunday and invite a handful of students. One day I received the invitation.

    After a couple of cups of the stuff I had a set of floating teeth so asked where the toilet was (sorry, bathroom for our American readers). Whilst sitting on the throne I noticed that there were two rolls of toilet paper, one roll of the soft stuff and one roll of the hard stuff which for those of you who can't remember was like tracing paper.

    After finishing up I went downstairs and carried on the art of polite conversation, but the two rolls of toilet paper were bugging me and so I had to ask. The lady of the house of course solved the mystery. The roll of soft paper was for normal use and the roll of hard paper was for use 'just in case Professor @~$)" had a sudden brilliant idea and needed to write it down before he forgot it.

    Wonderful !!

    Ed Almos

  75. Down the drain by willpost · · Score: 1

    "When the roll empties, then what?"

    Hire a certified consultant to wipe your butt.

  76. Physical placement of roll holder overlooked by ascii · · Score: 2, Interesting

    One neglected aspect of this whole discussion is the all important physical placement of the roll holder.

    One some toilets I've visited the arrangement fails to acknowledge that the distance to and / or placement of the roll holder relative to the actual toilet seat is an important design parameter.

    On some of these poorly designed arrangements the roll is placed almost, but not entirely out of reach forcing one to leave the seat which we all know feels somewhat ackward. Others place the roll holder closely besides or even behind the actual toilet in such a way that you initially panic in search of it and - after discovering it - physically stress your body trying to find a way to get to the roll.

    I think there's enough material in these observations for at least another paper on the subject.

    --
    naah sig schmig
  77. Er...well...hope this doesn't become standard by Anonymous Coward · · Score: 0
    I know this may sound odd, but I really hope this doesn't become standard...it would be a major problem for me personally.

    I have what's called an "ostomy", in particular an ileostomy -- basically means that my large intestine has been cut off and the trailing end of the small intestine was put through the abdominal wall. Over this opening (called a "stoma") I have to wear a plastic bag, which hangs down my belly.

    My butt, to continue the yucky details (what? you're still reading?), is now closed off. (Yes, I have a crack. Just no hole. Thankfully, I am not gay. Er.) The stool just goes into the bag. So no need to wash/wipe my tooshie anymore. But I *do* need to drain out the bag from time to time and clean it with -- you got it -- plain vanilla toilet paper. (Otherwise, brown stuff dribbles out the bottom of the bag...)

    Anyway, I hope you weren't eating when I told you all this...

    But such a toilet like you are describing would be a nightmare for me. I just hope people have good enough sense to just have plain old toilets without all the bells and whistles...then again, leave it to the Japanese to have a toilet like that.

  78. This is only a problem... by Boss,+Pointy+Haired · · Score: 1

    for stupid people that store their toilet roll somewhere other than in the toilet.

    I mean come on.

  79. patented solution by loudici · · Score: 1

    in my office building, one of the two rolls of paper is 'locked' by a little sticker which urges you to 'help save earth's resources by finishing the first roll first'- it also mentions that it is a patented device.

    L

    --
    Dev elpizw tipota, dev phoboumai tipota eimai lephteros http://euclidian.org
  80. The best solution. by purpledinoz · · Score: 1

    Here's the best and simplest solution: Leave an extra roll or two on top of the water tank of the toilet.

    It's simple and elagent.

  81. Bathroom technology by qengho · · Score: 1

    Surely there can't be more than one or two "optimal" toilet-paper-dispensing solutions

    Along those lines, I've wondered why urinal design hasn't converged on an optimal solution. It seems there's a new configuration every couple of years, yet the problems of back- and sidesplash have never been satisfactorily addressed.

    Oh well, I guess that's what shoe polish is for.

  82. Better toilet paper algorithm by Anonymous Coward · · Score: 0
    I found a bug in Algorithm Small, which I recall:

    Always take paper from the smallest roll.

    Problem is: when the two rolls are about the same diameter, measurement error can make this degenerate to Algorithm Random, because it is hard to evaluate which roll is the largest. There is then a non-negligible chance that the user(s) never reach a state where one roll is unambiguously the smallest, and the two roll empty simultaneously. Actually, if users follow Algorithm Small and replenish empty rolls immediately (an admittedly theoretical assumption), it will always occur that the two rolls are the same size after less than two rolls worth of paper, so the above risk is very real.

    We need a better algorithm. I've got one. I use the fact that paper rolls come with a glue seal on the first sheet, which helps us to formulate Algorithm Seal

    Take paper from a nonempty unsealed roll.

    On failure: unseal one roll an repeat the procedure.

    On exit: please replace any empty roll with a new sealed roll.

    First two steps are easy to memorize: just do the simplest possible thing to get paper.

    I hereby place this work in the public domain.

  83. Reminds me of this old News of the Weird blurb... by 3Suns · · Score: 2
    from News of the Weird circa 1998 or so:

    In April, Sir Roger Penrose, a British math professor who has worked with Stephen Hawking on such topics as relativity, black holes, and whether time has a beginning, filed a copyright infringement lawsuit against the Kimberly-Clark Corporation, which Penrose said copied a pattern he created (a pattern demonstrating that "a nonrepeating pattern could exist in nature") for its Kleenex quilted toilet paper. Penrose said he doesn't like litigation but, "When it comes to the population of Great Britain being invited by a multinational to wipe their bottoms on what appears to be the work of a Knight of the Realm, then a last stand must be taken".
    --

    -3Suns

    ~~~~
    The Revolution will be Slashdotted
  84. Uhmm by Anonymous Coward · · Score: 0

    Duh.. its called rotating your stock.. This algorithm applies to pretty much any supply item which comes in seperately pacakged units.

    For perishable items (prescriptions/food), it applies doubly so. Only have one package open, and use it up completely before opening the next. Always open the oldest package first (and if its too old for you to want to use it, dont open a newer one and save the older for later - it will just get older - if its too old to use now, throw it away)

    Of course TP doesnt expire so it doesnt matter which one you open as long as its stored somewhere appropriate, but the 'only one open at a time' rule still applies..

  85. Why do they call it? by weirdoh · · Score: 1

    TOILET PAPER METH? I have never understand that. Toilet paper is for wiping. Math is for comprehensive.