Supposedly, nine months after that NYC blackout, the hospitals were overflowing with newly-born babies!
Wonder if that will happen again.
But also of interest, if the skies are clear, definitely try to get to a rooftop or something (assuming there's not too many emergency streetlights set up) and look at the stars. This might be one of the last possible chances to see the Milky Way from the urban Northeast.
The main problem of the OJ trial was finding a jury worthy to determine the guilt of a celebrity. It was a positive feedback loop, when the difficulty arose to find an unbiased jury that didn't know about OJ or the crimes, the news agencies reported it, thus severely reducing the lot of potential jurors, etc.
Ultimately, only handful of people very out of step of current events could be chosen for the jury. IIRC, there was a similar problem for the Ollie North trials, but not nearly as bad. Goes to show that sports celebrities are more widely known than political entities.
Anyway, I don't know how business suits relate to juries, if they have them or not. But the problems inherent in the OJ case hopefully shouldn't present themselves here. You should be more concerned with the problems from the MSFT antitrust case. Where the company lied in court, was found guilty, and still got off the hook.
I think Robert Frost summed it up best when he said "A jury consists of twelve persons chosen to decide who has the better lawyer."
No, i mean use the three fingers designed for those numeric keypads. I've gone to countless supermarkets where the cashiers type quickly, but inefficiently, with one finger hopping all over the keypad. Kind of like when I first learned to type I used only my two index fingers on the whole keyboard.
It's a rare sighting when I see someone using a numeric keypad with all three fingers that the keypad was designed for (hence the little bump on the 5 key for centering).
Totally off-topic, but your Sumerian reference is interesting, because at my former college (U. Penn) there was a scam going on there about 10 years ago based on similar phrasing.
Some guy would pretend to be a newly-arrived African immigrant, asking his victim how to "get money from a wall." At that point, his accomplice would show up, pretending to be a stranger, also asking the student to help the poor guy out. The student, taking pity, would go to the ATM, enter their PIN, withdraw X dollars to show them how it's done.
Then, supposedly, the guy 'shows' the student how to keep his wallet safe from thieves, by hiding it in a white bag in his pants, and demonstrates with the students wallet. At which point he gives the student the white bag back, and leaves. Moments later, when the student realizes the white bag he was given doesn't have his wallet, the two guys are nowhere to be found. And usually there was a very recent subsequent cash withdrawl with the student's ATM card.
It was printed in my school paper that about half a dozen people got scammed this way. It was ridiculous, and even more so when I saw the movie "The Sting", where this scam was used exactly.
This brings up some common sense. Firstly and most importantly, does anybody enter their PIN clearly and slowly on the keypad? Especially if there are strangers present? I always block the keypad, and use all 3 fingers to do it so it's entered quickly and discretely. I also can't believe the students gave their wallets to the guy to hold for only a few seconds, and didn't check when he 'gave' it back.
But anyway, it all goes back to your Sumerian "Magic Wall". The phrasing that the thief used to imply his technological innocence and lack of understanding with modern Western society, hence creating a sense of pity in the victim.
Re:What does this have to do with ohm's law?
on
More on Spintronics
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· Score: 4, Informative
Ohm's law, in the form you've most likely heard it, relates the Voltage across a device to the current flowing through it. Microscopically, a more popular version of Ohm's Law relates the applied electric field to the local current density, which allows for spatial variations.
Not all devices are linear and follow Ohm's law over wide ranges of voltages/currents. Sometimes there's an exponential relation, or others. For example, in a superconducting filament, one has bizarre quantum effects kicking in for the effectively 1-D system, and the effective Ohm's law has the voltage proportional to exp[I]. Only linear (and hence Ohmic) at small currents.
Then there's the Hall Effect where a current flowing through a wire (can be a thin foil) with a perpendicular magnetic field will cause the current carriers (either electrons or holes) to drift to one side or the other of the foil [F=q(v x B)] where the F is the force, v is the carrier velocity, and B is the magnetic field. x is a cross-product (v and B are vectors, so is F). In other words, the force acting on the carriers is perpendicular to the B-field and the current velocity, and creates a transverse voltage, often called the "Hall Voltage". So you now have a current creating a transverse voltage, which lets you apply a variant of Ohm's Law to define a Hall Resistance, sometimes called Rxy, where Rxy=Vhall/I (could be a non-linear relation too).
So in this case of spintronics, they define another variant of Ohm's Law to relate the current of the spins in relation to an applied electric field. Note that the transfer of spins across the device probably doesn't correspond to the actual transfer of electrons, but a signal propagation of spins instead.
Finally, there are other cases where one can have current flow without resistance. One case is superconductors. Another is the so-called Quantum Hall Effect. However, both of these occur at cryogenic temperatures.
Same thing happened to an amazing company around in the late 1980's, called Gigabit Logic. They made GaAs logic IC's (gates, counters, multiplexers, etc) which operated at several GHz. THey were expensive, though, and unfortunately the sales didn't catch on. The lab I used to work at had a few random extra chips hanging around, which were the envy of others.
In the last few years logic speeds have approached this, and you can now by GHz-level gates as part of the ECLinPS family.
But HF is also useful for talking around the world, especially on relatively low power. Or contacting people in the boonies.
My uncle would occasionally sail from California to Hawaii on his sailboat, and would 'call' us form the middle of the Pacific. He did this establishing an HF connection to any HAM in the USA he could find who would set up a phone patch (patch the audio through the phone line), and call my house collect. Thus, me and my father, neither of us HAMS at the time, could talk to him.
Your idea of connections to all houses in the USA leaves out the utility of HF in the boonies, utility of HF in all other countries, and also the importance of low-power communications, including even the possible need to rig a CW transmitter a la Gilligan's Island for real emergencies, etc.
shuold government fund GPL-licensed software? Only OSS software companies may benefit from it. Microsoft oposes it strongly,
MSFT had absolutely no problem accepting the GPL for the use of PERL that came with the NT Resource Kit, and interestingly enough, published the GPL in the back of the book.
It's quite funny to see the GPL preamble in a MSFT Press book saying how commercial software takes away your rights, etc.
And conveniently now the "official" TCO for linux is $699 higher per CPU, which makes the whitepapers sway easier into MSFT's favor (considering only monetary cost factors, of course).
In all likelihood, this lab will be one of the first, and probably one of the only, places to purchase the SCO linux licenses.
Re:I see whitespace is still syntactically relevan
on
Python 2.3 Final Released
·
· Score: 4, Insightful
There's a feature I'd like to see removed.
I hear this repeated fairly often, but I can not think of any really good reason why whitespace is bad. IMHO, any decent programmer worth his/her salt will whitespace their code anyway for sanity.
Just to be my own devil's advocate, here are some reasons I can think of off the top of my head. But I don't think any is sufficiently great for not using python strictly because of it's required whitespace syntax.
Actually, I want to become proficient in python, I've even got a few books, and just haven't gotten around to programming any application in it yet:-( But these are things I've wondered about (regarding the whitespace). Hopefully a seasoned veteran can point out why these aren't substantial problems.
Putting a large block of code into a while or for loop.
In C, if I am quickly hacking some stuff together and realize I want to put 100+ lines into a for loop, I can put brackets around the code and possibly indent it later if I wind up keeping the code for long-term.
In python I'd have to manually go to all those lines and put the indent in. (I assume EMACS and other editors can do this automatically, if one knows the key combinations).
TABS and order of whitespace
This confuses me. Does python keep track of instances of \t in an input file? Are they distinguishable from spaces?
If at some nested level of indentation I'm at
[tab][space][space], is a line of
indentation of [space][space][tab] at the same nesting level?
If I'm at [space][space][space][space] can the next level of nesting be [tab]?
For decently-complex programs there might be so many nesting levels that the indented code is spaced so far inwards that one needs ridiculously-wide displays for sanity.
Personally, I don't think I've ever put more than 10 levels of nested blocks in a program somewhere, but I suppose it could possibly happen and might be a problem, especially of someone is restricted to 80-column screen for some reason.
Other than those rare or obscure issues, I can't think of any reason that mandatory whitespacing should hold someone back from python.
The exact mission you're describing - go a ways out there and look back at ourselves - has already been attempted.
Not to mention that it's difficult to point at Earth while making damn sure NOT to have the sun close to the field of view. Otherwise dead optics and other components.
This was a concern of the craft (I forget which) that took the shot of Earth that Sagan called "Pale Blue Dot".
I don't know if you realized this, but writing software is *HARD*. Harder than anything else in the physical world, mostly because there's no one right way to do things.
What? Have you ever done anything else in a professional manner? There might not be 30 ways to lay bricks, but there are more than 30 ways to build a house. Now optimize this for building time, materials, sturdiness, and long-term habitability. Not so easy, huh.
I'm not in any way degrading software writing, but claiming it's harder than anything else in the world is pretty narrow-minded and/or pompous BS.
Writing computer code has essentialy zero materials involved, which is why OSS is so successful. You can compile a program X number of times per day and iron out the kinks. Try doing that if you're an EE designing a VLSI chip. After designing and simulating, it'll cost a few g's to actually fab the chip. That's like one real compile. Imagine if you had to pay $2000 or more every time you compiled your code?
Take it a step further back to an architect building a house. For a decently-sized building, the construction can cost millions. If you messed up with your plans, you're career is ruined. This actually happened to a synagogue in my home town, the architect calculated the angles all wrong, and when they built it to spec, there was a large gap between two walls which should have joined. Not good. Now imagine if it was a skyscraper instead, and that the strength of the joints was overestimated. Brings a new meaning to having your project crash. Definitely not good.
Now writing code, and more specifically optimized and relatively bug-free code, is difficult. Much more difficult than someone that just learned to hack some VB (cough) code might believe. That is true. But if you claim it's harder than anything else in the physical world, that's just utter foolishness.
Global ridicule and ruining his life? I thought the video was funny, but I was NOT laughing AT the kid, but at the situation of some people taking a random kid acting out a light-saber battle and turning into a full-blown production-style piece of work.
Of course the kid looked goofy, but anybody other than either a practiced martial artist or having learned choreographed routine will look just as goofy.
What the hell is there to be embarrased over? If they put up a movie of him pissing himself during a high school presentation, or a private erotic video of him with his girlfriend, then that's one thing. But the star wars video "ruining his life"? Come on.
As Yoda would say, beating the shit out of someone this is not.
The 120v from a US wall socket is not enough to kill you.
No! Well, if you want to Darwin yourself, go ahead, but this is for the benefit of other/.ers that might actually believe you.
120 VAC conducted through relatively dry skin and with no other bodily paths to ground for a short enough time might not be so bad. Even at 240 VAC too.
Now if you've just come out of the shower, and your feet are touching a nice wet grounded contact, or say one of your hands is touching the bathtub spigot, while you touch the hot lead of 120 VAC, say bye-bye. Actually, you won't be able to say it, your muscles will just quiver at 60 Hz (really at 120 Hz [I think] because you'll get two quivers for each cycle) until your heart fibrillates.
If that still sounds relatively tame, you can take two thumbtacks, press them deep into your thumbs, and connect them across the 120 VAC. You might get a nice scent of roasting meat for a few seconds too. To bad you'll be cooking and electrocuting yourself and unable to autocanabalise yourself instead.
I do not know the current, but I do know it won't kill you,
Ohm's Law. Well, sort of. The resistance of the human body is non-linear, and also non-homogeneous. As you lower the resistance through any means, you'll have more current flow. If that current flows through your heart, it can be more likely to give your heart fibrillations. Translation - 120 VAC can kill you.
you forgot air resistance, which is the real tricky part.
You've got an odd-shaped piece of foam moving at relatively high-speed through thin air. Also take into consideration the streamlines created as the orbiter and fuel tank accelerate upwards. It's a very complicated aerodynamical and fluid-dynamical process to calculate what force the air streams would have to slow the foam down relative to the orbiter.
but what exactly would they do if the damage was too severe to be repaired?
in this case, where heatup during reentry would be a huge problem with a damaged wing, I was wondering if they could bring the shuttle in at a very oblique trajectory consisting of many orbits of slightly-decreasing radii to aerobrake it orders-of-magnitude more gradually than they currently do now.
If everyone were one religion, Muslim, Christian, or Jewish, then we would have peace.
No, definitely not true. Factions within these religions would still duke it out even if everybody were one religion. Shiite vs Sunni Muslims. Orthodox vs. Reform Jews. Protestant vs. Catholic Christians. Etc etc.
It's only that warring factions join forces temporarily to overthrow a common enemy. After the enemy is gone, the factions usually split up again.
War is basically a problem of human nature involving ego, greed, and power. Unfortunately, one of the few things that could make humans worldwide join ranks together would be an extra-terrestrial threat.
yes, p=mv is only applicable for massive particles at non-relativistic speeds.
Momentum is usually defined in two ways. Look up the canonical equations of motion for Hamiltonian and Lagrangian mechanics to see different definitions of momentum. I don't have time to explain it now.
Yeah, dselect does blow chunks. And is the only real annoying part of the install.
My suggestions to anyone using debian are to skip past dselect during the install, and then apt-get everything afterwards. You can find out what packages there are by looking at packages.debian.org.
Another hint you might want is that I've had problems getting the debian config programs to set up my XF86Config-4 file correctly. If you're moving to Debian from another linux, I'd recommend backing-up this config file for you to use after Debian is set up.
Other than that I haven't had any real problems with the install.
Granted I don't know much about the silicon dioxide processing business, but wouldn't the new sand used to create the new glass come with the exact same set of problems? That argument only really makes sense if we're going to stop glass production after disposing of our current waste glass.
Regarding heat and chemicals, after digging for new sand, you still have to melt it down, costing a similar amount heat, as well as cleaning the glass with caustic chemicals. I would guess that refining the sand to pure glass would cost more than refining dirty glass into new glass.
At least recycling old bottles saves some of the cost of having to quarry for the sand. Helps with waste-dispoal too. Plus, you can use (gasp) SAND to terrain your golf courses.
IMHO, it seems that processing old-glass-to-new-glass and sand-to-landscaping would be more optimized than old-glass-to-landscaping and sand-to-newglass. The first cycle seems more optimized for the long-term too.
I'm curious, did your economics prof analyze these issues? Or just the short-term calculation of disposing of our current supply of waste glass?
Actually, that's more of a New York Post kind of headline.
Anyway, it reminds me of the Calvin and Hobbes cartoon where Calvin asks his mom if he can write a story about her for a "newspaper" he's making. She agrees, he asks what she's doing, she says she's making dinner while she's cutting up a fish.
In the next pane of the comic you see Calvin's article, and the title is "Crazed Knife-Wielding Mother Hacks Icthyoid to Death. 'It's a Daily Custom' says child."
Slashdot Mirror
But also of interest, if the skies are clear, definitely try to get to a rooftop or something (assuming there's not too many emergency streetlights set up) and look at the stars. This might be one of the last possible chances to see the Milky Way from the urban Northeast.
Ultimately, only handful of people very out of step of current events could be chosen for the jury. IIRC, there was a similar problem for the Ollie North trials, but not nearly as bad. Goes to show that sports celebrities are more widely known than political entities.
Anyway, I don't know how business suits relate to juries, if they have them or not. But the problems inherent in the OJ case hopefully shouldn't present themselves here. You should be more concerned with the problems from the MSFT antitrust case. Where the company lied in court, was found guilty, and still got off the hook.
I think Robert Frost summed it up best when he said "A jury consists of twelve persons chosen to decide who has the better lawyer."
No, i mean use the three fingers designed for those numeric keypads. I've gone to countless supermarkets where the cashiers type quickly, but inefficiently, with one finger hopping all over the keypad. Kind of like when I first learned to type I used only my two index fingers on the whole keyboard.
It's a rare sighting when I see someone using a numeric keypad with all three fingers that the keypad was designed for (hence the little bump on the 5 key for centering).
Some guy would pretend to be a newly-arrived African immigrant, asking his victim how to "get money from a wall." At that point, his accomplice would show up, pretending to be a stranger, also asking the student to help the poor guy out. The student, taking pity, would go to the ATM, enter their PIN, withdraw X dollars to show them how it's done.
Then, supposedly, the guy 'shows' the student how to keep his wallet safe from thieves, by hiding it in a white bag in his pants, and demonstrates with the students wallet. At which point he gives the student the white bag back, and leaves. Moments later, when the student realizes the white bag he was given doesn't have his wallet, the two guys are nowhere to be found. And usually there was a very recent subsequent cash withdrawl with the student's ATM card.
It was printed in my school paper that about half a dozen people got scammed this way. It was ridiculous, and even more so when I saw the movie "The Sting", where this scam was used exactly.
This brings up some common sense. Firstly and most importantly, does anybody enter their PIN clearly and slowly on the keypad? Especially if there are strangers present? I always block the keypad, and use all 3 fingers to do it so it's entered quickly and discretely. I also can't believe the students gave their wallets to the guy to hold for only a few seconds, and didn't check when he 'gave' it back.
But anyway, it all goes back to your Sumerian "Magic Wall". The phrasing that the thief used to imply his technological innocence and lack of understanding with modern Western society, hence creating a sense of pity in the victim.
Not all devices are linear and follow Ohm's law over wide ranges of voltages/currents. Sometimes there's an exponential relation, or others. For example, in a superconducting filament, one has bizarre quantum effects kicking in for the effectively 1-D system, and the effective Ohm's law has the voltage proportional to exp[I]. Only linear (and hence Ohmic) at small currents.
Then there's the Hall Effect where a current flowing through a wire (can be a thin foil) with a perpendicular magnetic field will cause the current carriers (either electrons or holes) to drift to one side or the other of the foil [F=q(v x B)] where the F is the force, v is the carrier velocity, and B is the magnetic field. x is a cross-product (v and B are vectors, so is F). In other words, the force acting on the carriers is perpendicular to the B-field and the current velocity, and creates a transverse voltage, often called the "Hall Voltage". So you now have a current creating a transverse voltage, which lets you apply a variant of Ohm's Law to define a Hall Resistance, sometimes called Rxy, where Rxy=Vhall/I (could be a non-linear relation too).
So in this case of spintronics, they define another variant of Ohm's Law to relate the current of the spins in relation to an applied electric field. Note that the transfer of spins across the device probably doesn't correspond to the actual transfer of electrons, but a signal propagation of spins instead.
Finally, there are other cases where one can have current flow without resistance. One case is superconductors. Another is the so-called Quantum Hall Effect. However, both of these occur at cryogenic temperatures.
In the last few years logic speeds have approached this, and you can now by GHz-level gates as part of the ECLinPS family.
My uncle would occasionally sail from California to Hawaii on his sailboat, and would 'call' us form the middle of the Pacific. He did this establishing an HF connection to any HAM in the USA he could find who would set up a phone patch (patch the audio through the phone line), and call my house collect. Thus, me and my father, neither of us HAMS at the time, could talk to him.
Your idea of connections to all houses in the USA leaves out the utility of HF in the boonies, utility of HF in all other countries, and also the importance of low-power communications, including even the possible need to rig a CW transmitter a la Gilligan's Island for real emergencies, etc.
MSFT had absolutely no problem accepting the GPL for the use of PERL that came with the NT Resource Kit, and interestingly enough, published the GPL in the back of the book.
It's quite funny to see the GPL preamble in a MSFT Press book saying how commercial software takes away your rights, etc.
Did the CIA help him out after he admitted terrorist actions? No. But the Taliban did.
Apples and oranges.
In all likelihood, this lab will be one of the first, and probably one of the only, places to purchase the SCO linux licenses.
I hear this repeated fairly often, but I can not think of any really good reason why whitespace is bad. IMHO, any decent programmer worth his/her salt will whitespace their code anyway for sanity.
Just to be my own devil's advocate, here are some reasons I can think of off the top of my head. But I don't think any is sufficiently great for not using python strictly because of it's required whitespace syntax.
Actually, I want to become proficient in python, I've even got a few books, and just haven't gotten around to programming any application in it yet :-( But these are things I've wondered about (regarding the whitespace). Hopefully a seasoned veteran can point out why these aren't substantial problems.
- Putting a large block of code into a while or for loop.
-
TABS and order of whitespace
- For decently-complex programs there might be so many nesting levels that the indented code is spaced so far inwards that one needs ridiculously-wide displays for sanity.
Other than those rare or obscure issues, I can't think of any reason that mandatory whitespacing should hold someone back from python.In C, if I am quickly hacking some stuff together and realize I want to put 100+ lines into a for loop, I can put brackets around the code and possibly indent it later if I wind up keeping the code for long-term.
In python I'd have to manually go to all those lines and put the indent in. (I assume EMACS and other editors can do this automatically, if one knows the key combinations).
This confuses me. Does python keep track of instances of \t in an input file? Are they distinguishable from spaces? If at some nested level of indentation I'm at [tab][space][space], is a line of indentation of [space][space][tab] at the same nesting level?
If I'm at [space][space][space][space] can the next level of nesting be [tab]?
Personally, I don't think I've ever put more than 10 levels of nested blocks in a program somewhere, but I suppose it could possibly happen and might be a problem, especially of someone is restricted to 80-column screen for some reason.
Not to mention that it's difficult to point at Earth while making damn sure NOT to have the sun close to the field of view. Otherwise dead optics and other components.
This was a concern of the craft (I forget which) that took the shot of Earth that Sagan called "Pale Blue Dot".
What? Have you ever done anything else in a professional manner? There might not be 30 ways to lay bricks, but there are more than 30 ways to build a house. Now optimize this for building time, materials, sturdiness, and long-term habitability. Not so easy, huh.
I'm not in any way degrading software writing, but claiming it's harder than anything else in the world is pretty narrow-minded and/or pompous BS.
Writing computer code has essentialy zero materials involved, which is why OSS is so successful. You can compile a program X number of times per day and iron out the kinks. Try doing that if you're an EE designing a VLSI chip. After designing and simulating, it'll cost a few g's to actually fab the chip. That's like one real compile. Imagine if you had to pay $2000 or more every time you compiled your code?
Take it a step further back to an architect building a house. For a decently-sized building, the construction can cost millions. If you messed up with your plans, you're career is ruined. This actually happened to a synagogue in my home town, the architect calculated the angles all wrong, and when they built it to spec, there was a large gap between two walls which should have joined. Not good. Now imagine if it was a skyscraper instead, and that the strength of the joints was overestimated. Brings a new meaning to having your project crash. Definitely not good.
Now writing code, and more specifically optimized and relatively bug-free code, is difficult. Much more difficult than someone that just learned to hack some VB (cough) code might believe. That is true. But if you claim it's harder than anything else in the physical world, that's just utter foolishness.
Of course the kid looked goofy, but anybody other than either a practiced martial artist or having learned choreographed routine will look just as goofy.
What the hell is there to be embarrased over? If they put up a movie of him pissing himself during a high school presentation, or a private erotic video of him with his girlfriend, then that's one thing. But the star wars video "ruining his life"? Come on.
As Yoda would say, beating the shit out of someone this is not.
No, a 747 needs to go horizontal at air-speed velovity to generate enough lift to "defy gravity".
I want something that can go straight upwards. Did anybody patent the helicopter yet?
No! /.ers that might actually believe you.
Well, if you want to Darwin yourself, go ahead, but this is for the benefit of other
120 VAC conducted through relatively dry skin and with no other bodily paths to ground for a short enough time might not be so bad. Even at 240 VAC too.
Now if you've just come out of the shower, and your feet are touching a nice wet grounded contact, or say one of your hands is touching the bathtub spigot, while you touch the hot lead of 120 VAC, say bye-bye. Actually, you won't be able to say it, your muscles will just quiver at 60 Hz (really at 120 Hz [I think] because you'll get two quivers for each cycle) until your heart fibrillates.
If that still sounds relatively tame, you can take two thumbtacks, press them deep into your thumbs, and connect them across the 120 VAC. You might get a nice scent of roasting meat for a few seconds too. To bad you'll be cooking and electrocuting yourself and unable to autocanabalise yourself instead.
I do not know the current, but I do know it won't kill you,
Ohm's Law. Well, sort of. The resistance of the human body is non-linear, and also non-homogeneous. As you lower the resistance through any means, you'll have more current flow. If that current flows through your heart, it can be more likely to give your heart fibrillations. Translation - 120 VAC can kill you.
You've got an odd-shaped piece of foam moving at relatively high-speed through thin air. Also take into consideration the streamlines created as the orbiter and fuel tank accelerate upwards. It's a very complicated aerodynamical and fluid-dynamical process to calculate what force the air streams would have to slow the foam down relative to the orbiter.
in this case, where heatup during reentry would be a huge problem with a damaged wing, I was wondering if they could bring the shuttle in at a very oblique trajectory consisting of many orbits of slightly-decreasing radii to aerobrake it orders-of-magnitude more gradually than they currently do now.
No, definitely not true. Factions within these religions would still duke it out even if everybody were one religion. Shiite vs Sunni Muslims. Orthodox vs. Reform Jews. Protestant vs. Catholic Christians. Etc etc.
It's only that warring factions join forces temporarily to overthrow a common enemy. After the enemy is gone, the factions usually split up again.
War is basically a problem of human nature involving ego, greed, and power. Unfortunately, one of the few things that could make humans worldwide join ranks together would be an extra-terrestrial threat.
Momentum is usually defined in two ways. Look up the canonical equations of motion for Hamiltonian and Lagrangian mechanics to see different definitions of momentum. I don't have time to explain it now.
physicist...free time
ouch, my brain hurts...
My suggestions to anyone using debian are to skip past dselect during the install, and then apt-get everything afterwards. You can find out what packages there are by looking at packages.debian.org.
Another hint you might want is that I've had problems getting the debian config programs to set up my XF86Config-4 file correctly. If you're moving to Debian from another linux, I'd recommend backing-up this config file for you to use after Debian is set up.
Other than that I haven't had any real problems with the install.
Regarding heat and chemicals, after digging for new sand, you still have to melt it down, costing a similar amount heat, as well as cleaning the glass with caustic chemicals. I would guess that refining the sand to pure glass would cost more than refining dirty glass into new glass.
At least recycling old bottles saves some of the cost of having to quarry for the sand. Helps with waste-dispoal too. Plus, you can use (gasp) SAND to terrain your golf courses.
IMHO, it seems that processing old-glass-to-new-glass and sand-to-landscaping would be more optimized than old-glass-to-landscaping and sand-to-newglass. The first cycle seems more optimized for the long-term too.
I'm curious, did your economics prof analyze these issues? Or just the short-term calculation of disposing of our current supply of waste glass?
In a world without walls, there's no need for Windows.
In a world without fences, there's no need for Gates.
Anyway, it reminds me of the Calvin and Hobbes cartoon where Calvin asks his mom if he can write a story about her for a "newspaper" he's making. She agrees, he asks what she's doing, she says she's making dinner while she's cutting up a fish.
In the next pane of the comic you see Calvin's article, and the title is "Crazed Knife-Wielding Mother Hacks Icthyoid to Death. 'It's a Daily Custom' says child."
Calvin and Hobbes was awesome!