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Everything posted by Flashman

  1. The probability of one solid object passing through another is not zero. It's some stupidly low number like 1x10^-23 but nevertheless remains "possible". Meaning that if you drop a penny on your desk a septillion times or so, one of these millenia, it will fall through... Though that might not be entirely accurate, it might be more like the possibility of the first plane of atoms passing the first plane in the other object being 10^-23, so it might just "stick funny". But remembering our Rutherford scattering experiment, that of an 8000/1 shot that you hit a gold nucleus, would mean t
  2. Soot happens due to insufficient oxygen. Nitrous Oxides happen due to high combustion temperatures. Water injection metered properly should not cause soot, in fact it's a well known "fix" for cleaning out a carboned up engine. It can however reduce NOx. It's possible that a well tuned engine with water injection could meet tailpipe emissions standards without a catalytic convertor, and due to the change in thermodynamic properties occasioned by putting something other than gasoline and air into a motor, can enhance efficiency. However, catalytic convertors are mandatory, so no auto manufacture
  3. Excess stocks of turn of the 19th Century bolt action rifles were converted to emergency issue light machine guns in WWII with a few simple machine shop parts... It's very easy for a determined psychopath to do this. Rigging forward pistol grips or fold down stocks is trivial. There's nothing too complicated about making extended capacity magazines either. Jewish resistance fighters in the Warsaw ghetto made submachine guns out of plumbing parts. It's very rare indeed that a major shooting incident is the result of someone "Just snapping" they've been planning it for months, even years. Guns
  4. http://en.wikipedia.org/wiki/Chitin And hammers are usually pretty effective.
  5. Well I'd call it a glaring error that your construction appears to be missing a Planck.
  6. There might be 5mm allowance for using it on an older/newer body with an adaptor ring.
  7. Anyone who "really" knows probably isn't allowed to discuss it. However, last I heard, resolution from orbit was on the order of baseball sized objects, say 4 inches. There would be relatively huge problems getting much beyond this due to atmospheric instability and haze. Now spyplanes have much less atmosphere to see through, and may be able to duck below high level cloud and haze and can read a license plate from 10s of thousands of feet and a few miles away. Let's say they've got about half an inch resolution. But, if you want to get to a point of about quarter inch resolution tha
  8. Presuming that the posters have to represent something in some degree of detail to convey a basic understanding of a topic or demonstrate the scope of it, I'd go for a kind of "fractal" approach. What I mean by that is, have something that's eyecatching and legible from across the room, large heading, maybe large central diagram. Then have elements that are eyecatching and legible from say 10ft away, interesting sub headings to pull the reader in, then have "half page" or single paragraph details under each subheading that are readable from 2-3 feet away. I guess I might aim for the style/layo
  9. He only has a 100mm refractor apparently, stand by, finding the story that mentions his equipment... Ah this is it... http://www.thestar.com/sciencetech/article/543342 Doesn't say what sort of video camera he used though, "professional" style cooled CCD, converted webcam, hacked handycam or what.
  10. When they find extraterrestrial bacteria, it's going to be a mindjob either way... in that either they have common DNA base pairs with earth life, or they don't.
  11. There are many parameters involved, it will vary by material and either thickness of material or depth of cut. Torque may or may not be so important since some edge moulding bits have a bearing on the bottom. Also important may be the cutting angle of the bit, this is often selected by material. Then of course in practical usage, cut quality comes into it, you can get a powerful high speed router and ram it through a material as hard as you can, and get a ragged cut with charred edges. These pages may help you in defining your problem fully and getting towards an answer... h
  12. Oh right, somehow I got the idea that you were just complaining it didn't look right. Right, so are you wanting to know how many pixels are contained within the circle, or how many pixels are required to form the perimeter? The number inside the circle will be close to the area of the circle, the number on the perimeter close to the standard calculation for perimeter. These get more accurate as the size of the circle increases, but for the perimeter specifically, you'll tend to get overlapped pixels, maybe missed pixels, depending on how it decides whether to draw them or not. But
  13. Your problem is that pixels often aren't truly square. The amount of deviance from square depends on your particular display device. CRT monitors may be able to be calibrated so that they display everything in the correct aspect ratio by altering the controls.
  14. The "resolving power" of a telescope is limited by it's aperture. This means it can support about 50x magnification per inch of lens or mirror diameter. So, if you want 400x magnification, you need to be looking at an 8 inch scope. Department stores sell cheap 60mm refractor (telescopes with an objective lens) telescopes that advertise something ridiculous like 675x magnification, but for all practical purposes they are only good to about 120x... if that, due to generally poor quality lenses. Telescopes with objective lenses get very expensive as they get larger, making reflector telescop
  15. Interesting... Something that occurs to me though, is wondering if the anatomical changes in sapiens specimens represent a re-adaption to using the arm overhead. If the neanderthals retained a shoulder and arm structure closer to a brachiating ape, then habitual overarm movements might not displace their bones in the same manner. Although it's also curious that chimpanzees are known to throw rocks and sticks, both in hunting and to ward off attackers. The contention in this article... http://www.newscientist.com/article/dn3085-neanderthals-strongarm-tactics-revealed.html That bone
  16. Sort of a funny/curious story about that... "back in the day" circa '95 or '96 I was playing around with slackware and a 486DX33 machine with 8MB RAM... I put 2 floppy drives in the machine, then discovered that the drive and head IDs were switched from "normal" on one of the drives, however, this particular motherboard seemed to handle that rather strangely, and with a buddy, we were able to figure out how to make a device with 4 heads and double the number of tracks, that formatted to 2.88MB (with two floppies in of course) Now, the interesting thing was, it turned out also to be twice as fa
  17. Interesting stuff, maybe NASA can use it in the joints of their solar panel arms Wonder how many million miles you could get out of a car engine coated with it....
  18. I watched more closely again. It seemed "real" at first because the poor quality video made it look like they ran together when tipped off his hand, also one time he dropped one it looked a little like it squished out from between his fingers. However, with replaying and getting a better feed (do video sites drop quality with demand sometimes?? seems like it) then they appear more solid, and more suspect, particularly when the surface of the liquid looks bumpy.
  19. hmmm perhaps I'm thinking backwards again... however, the only way that is possible is to have high surface tension. Sodium ethanoate does nothing special? http://en.wikipedia.org/wiki/Sodium_acetate Seems to me it's some combination of supercooling and adding table salt to stop it crystalising. Seems there's a lot of voodoo chemistry in those clips though, that heat to 550 degrees thing is obviously wrong. I think basically you're just making sure there's no crystals of the acetate forming..
  20. Wow that looks fun The "explanation" sounds sort of rightish, since when you highly polarise a substance you reduce it's surface tension, so to completely depolarize it you'd give it high surface tension. At a guess I'd say the last thing you'd want to be in excess would be the vinegar, because that has a polarising effect, so if you don't put enough bicarb in it probably won't work.
  21. Reasonableness! Pah, that's a slippery slope, next you'll be insisting people have a sense of proportion and don't see everything in black and white terms.
  22. Flashman

    ghost theory

    Yer average "psychic" tends to be skilled at psychiatric tricks, much as a stage "mentalist" is. In other words, they could quite well pick up cues that homicide investigators give unwittingly about their hunches, and could quite well have the capacity to "profile" a killer much like a legitimate psychiatrist would. Hence, even a fraud may have some use in some investigations. I have heard that there's psychics out there trying to make a name for themselves that along with a few hundred other crackpots, phone in a prediction for every murder that appears in the media, they only have to get "cl
  23. Odd, that sounds more like nickel but that should have been magnetic as the powder.
  24. It would essentially be determined by the speed of sound in that material.
  25. My best guess right now is chromium powder, in which case when you crystalise the green stuff then dehydrate it, it should turn purple.
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