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User: ralfmuschall

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  1. Now Twitter has to top that and build an array with 128 receptors.

  2. He was anti-war all life long on Mathematics Great Alexander Grothendieck Dies At 86 · · Score: 5, Informative

    The snippet above ("before abandoning the discipline, taking up anti-war activism") sounds as if he had switched from math to politics in 1970. Truth is, he was an anti-war activist all life long, i.e. against France's Algeria war, and he even gave lectures in Vietnam during wartime (1967). Some biographic texts about him are available at http://www.scharlau-online.de/... (AFAICT in german).

  3. Re:So let me get this straight... on Robot Snake Could Aid Search and Rescue Operations · · Score: 1

    My problem with this is that robosnakes seem to get worse. The ones that Gavin Miller build a decade ago were autonomous (and one even could sidewind), the things in the video just looked like bags filled with The Creeping Chaos. Maybe the toy industry should take care of the problem, and then one could add search&rescue tools to cheap smart chinese toy robosnakes.

  4. Re:So instead..... on Robot Snake Could Aid Search and Rescue Operations · · Score: 1

    I expect that this is the plan. Just send hundreds of robosnakes into the building. Staring at the screens is cheap, and then you can send the trained personnel to the places where help is needed.

  5. Re:Panic Factor on Robot Snake Could Aid Search and Rescue Operations · · Score: 1

    *First world people* fear snakes, with the bible (Gen 3:1-5) being a significant cause IMHO. In countries where seriously venomous snakes exist, they are venerated a holy animals, and people are aware that trying to kill a snake is a bad idea (it is the snake which you don't see (and therefore step on it) that bites you). A snake being seen crawling around is harmless *unless you attack it*, and even then it will most probably flee.

  6. Re:May be a social issue with using snakes on Robot Snake Could Aid Search and Rescue Operations · · Score: 1

    I don't think this is a problem. People in India who suffer from snakebites (the agile cobras cause only a small minority of the accidents, most are vipers which are to lazy to run away (Romulus Whitaker did an analysis of that a few years ago)) get bitten from stepping on them (or rolling onto them whilst asleep in the case of kraits). A cobra seeing you trapped under rubble would simply ignore you for not being a threat. I assume that people in India are aware of these facts (but OTOH I'd expect first-world-people to panic when they have serious problems (like e.g. the smartphone not working properly) and a baby corn snake approaches them).

  7. Re:overhead wires or third rails on Ski Lifts Can Could Help Get Cargo Traffic Off the Road · · Score: 1

    The tonnage (proportional to the required strength) of the pulling rope depends only on the mass and the inclination of the path of the goods. The inclination is determined by the terrain profile and by the curvature of the non-moving suspension rope, and the latter can be minimized by having more support posts. Unless on wants to lift very heavy goods up along a steep course, I don't think that friction of the pulling rope plays a big role.

  8. Re:Is YY possible? on Scientists Create Mice From 2 Fathers · · Score: 2

    Then blood type would be essentially haploid, i.e. we'd have just genotypes A, B, 0 instead of the observed AA, A0, 00, AB, BB, B0 (where A0/AA and B0/BB are phenotypically the same). AFAIK the blood type is autosomal on chromosome 16.

  9. Re:Does it work ? on How Not To Design a Protocol · · Score: 3, Insightful

    Your way of thinking is nice, but it is exactly this attitude that gets developers fired (or their bosses broke if they share that attitude and don't fire you, in which case an inferior insecure competing product will dominate) for thinking too much instead of getting the product out. That's why we are up to the neck in inferior goods, protocols just being one example. Not even death penalty (e.g. for melamine in chinese milk) does seem to stop this.

  10. Re:This Failed in NYC on Govt To Bomb Guam With Frozen Mice To Kill Snakes · · Score: 1

    There is a theory that the intention of the rabbit import was even worse: Some english aristocrazies wanted to go hunting foxes, and their idea was that the wild foxes need something to eat, so they introduced rabbits as well.

  11. Re:GPS? on Helicopter Crashes While Filming Autonomous Audi · · Score: 1

    > Human beings have no business driving

    I agree (I hate it when I have to drive). With robo-cars, there is another problem: Lots of traffic laws are routinely and massively broken. In .de (and probably everywhere), the law fixes a minimal safety distance for different speeds and types of road - and the real distance that the drivers keep is a third to a half of that. This is not just bad behavior - tripling the distance would cut the capacity of the road to a third (unless you triple the speed as well, which would not increase safety either), and there are just not enough roads for that (one would need three times the area for roads as well).

    Now, if a robot drives a car, he has two options: Follow the law, cause a traffic jam behind himself (or even provoke somebody to cut into the seemingly extremely long clearance) and be hated by everybody; or drive like everyone else and be sued out of business if something bad happens.

  12. Re:Too soon on Helicopter Crashes While Filming Autonomous Audi · · Score: 1

    As others already wrote, there is an efficient way to use all lanes and merge directly before the obstacle. But this is not the question - the antisocial personality of those people enables them to afford such luxury cars in the first place. Here in .de, seeing cars of certain brands (those with "builtin right-of-way") automatically means "CAUTION!". Googling for "Wiehltalbruecke" helps.

  13. Re:Who is it for? on Super Principia Mathematica · · Score: 2, Informative

    After seeing the samples at
    http://www.superprincipia.com/my_FLOM_EBook/Vol_1_FLOM_e_Book.html
    I retract my statement containing the word "pleasant".

  14. Re:I'm sure the book is great n all, but... on Super Principia Mathematica · · Score: 1

    Exactly. And Einstein also wrote "For me the Jewish religion like all others is an incarnation of the most childish superstitions.". And this was revealed in Medina^W^W^W written shortly before his death, so it supersedes all earlier conflicting messages ;-)

  15. Re:Who is it for? on Super Principia Mathematica · · Score: 1

    There is no equally-named Kemp on arxiv.org (there is a "R.Kemp", where "R." seems to stand for "Roger" in two solid-state chemistry/physics papers), and there are no google hits with his name and +site:.edu.

    On http://www.superprincipia.com/About_The_Author.htm is the author's CV, he is essentially a radar engineer (probably a good one given the companies he worked at), and worked as a math teacher at some time. In the autumn of 1989 he suffered an attack of Holy Spirit and seems not to have recovered yet.

    Unfortunately the website gives no sample chapters for download. I'd expect the book to be a stylistically pleasant reading, but I cannot tell if the hard core physics stuff is correct (and free from esoteric stuff). When in doubt, I'd stick with Penrose (his two-volume book with Rindler is great, his popular stuff as well (except when he tries to push his unorthodox interpretation of quantum mechanics)).

    The wensite says the book requires "basic understanding into algebra, geometry, differential calculus, and integral calculus". Since that little math is not even sufficient to understand the currently generally accepted theories of physics (one needs at least differential geometry, algebraic topology, functional analysis and Lie groups for even the simplest things), I have some doubts whether the book really *explains* physics or just tells a story *about* physics.

    The fact that he has no PhD should not matter (he seems not to want one), and even Einstein got PhD his only a year after Special Relativity.
    His paper about photons is mostly prose with very few equations in between, and sounds strange (to say it mildly), which has already been mentioned by other commenters here.

    Meta-question: Why is "Post anonymously" next to the checkbox written in white on white background? Buggy CSS or broken browser?

  16. Re:Two words.... on Robot Snake Can Climb Trees · · Score: 1

    Robotic doctor! (see "Planet of the Dead")

  17. Re:I see nothing snake-like here.. on Robot Snake Can Climb Trees · · Score: 1

    The twisting on the ground looks like an attempt at sidewinding, but the videos at the linked site show that the robots can do that properly (maybe they need a good ground for that - but sidewinding *is* for flat grounds whereas undulation is OK for crawling among vegetables).
    Rolling (both on the ground and as a method of climbing trees) is not that bad - it is easy for robots but hard for real snakes (whose scales are specialized for locomotory use only on the ventral side).
    Btw., Gavin Miller (http://www.snakerobots.com/S3.html) made a working sidewinder back in 1996.

  18. But echinoderms are(was: cephalopods are no crime) on Ikatako Virus Replaces Victims' Files With Pictures of Squid · · Score: 3, Funny

    True, but he also installed also pics of sea urchins, who are the enemy in the Great Invertebrate War.

  19. I have some trouble believing this on Man Takes Up Internal Farming · · Score: 1

    Raw ripe peas are almost as hard as stones and indigestible (it takes soaking for a day and cooking for at least half an hour before the are edible (there are breeds of pea which can be eaten raw, but only the very young unripe fruits, which would not germinate)). I'd like to know what he really did.

  20. Re:Hoist him by his own petard on Rupert Murdoch Claims To Own the 'Sky' In 'Skype' · · Score: 1

    Then Paul Graham will sue them both for the Y (i.e. S (K (S I I)) (S (S (K S) K) (K (S I I))) ).

  21. Re:Wrong on US Students Struggle With Understanding of the 'Equal' Sign · · Score: 1

    Of course not. In a sane language. there *is* no such thing as assignment.

  22. Re:False assumption on Sentence Spacing — 1 Space or 2? · · Score: 1

    This might work in languages where indentation is just for humans. In Python, where indentation matters, tabs are evil (you would need to *know* how wide was a tab in the machine of the guy who wrote the code in order to read or edit it). This information usually is not part of the source (unless the author inserted a file variable (i.e.
    "# -*- tab-width: 7 -*-")).

  23. Spirit fhtagn on Mars Rover Spirit May Never Wake From Deep Sleep · · Score: 1

    She is not dead, she fhtagn. And she will awake when the stars are right (just one star is enough).

  24. Re:can we try something different? on South Korea Deploys Killer Robot In DMZ · · Score: 2, Informative

    It doesn't really matter what the west thinks about communism - NK is a theocracy now, with a god-king at the top and a caste system below. They started replacing marxism with the artificial Chuche-religion (more weird than Scientology, and probably as evil) in the seventies.
    The only chance for NK is IMHO a internal enlightenment in parts of the leading junta (the only people there who know that there is a different world outside, and probably don't believe in the Chuche crap they made up for the ordinary people). All the world can do is to offer the leaders a retirement without being killed; and an efficient, friendly madhouse for the deprogramming of the population.

  25. Re:Danger vs. Visibility on Tsunami Warning From Space? · · Score: 1

    A purely unrealistic idea came after submitting: Instead of illuminating the whole area, illuminate a mm-sized milliwatt-powered spot every meter. Such a spot is visible on the ground even in daylight (laser pointers to exactly that). Unfortunately, the laws of optics get in the way: To get meter-resolution on the ground, we need meter-sized optics in orbit (that's what spy satellites do (to get resolutions in the decimeter range, they fly very low and crash down all the time due to aerobraking)). For mm-resolution, we'd need kilometer-sized satellites.