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  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

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#51 Re: Dark Discussions at Cafe Infinity » LEGO Challenge » 2007-07-27 13:09:24

My project will probably be done around late Nov., so I'm going to push the deadline back to July 4, 2008. This is because I started mine in mid june, and am still nowhere near completing it, so anyone joining about now will require a longer time.

#52 Re: Puzzles and Games » lightning's spelling Bee » 2007-07-21 16:35:25

2 Doesn't seem to be. It should be "liquefy".
3 Should be "symmetry".
4 You didn't spell it right, again. Should be "sacrilegious"

#53 Re: Dark Discussions at Cafe Infinity » Global Warming scenarios » 2007-07-21 16:33:06

I'm sorry if you found that that was directed at you... it wasn't. It was a general bit of advice.

I'd rather not comment any further, really.

#55 Re: Dark Discussions at Cafe Infinity » Global Warming scenarios » 2007-07-10 07:44:29

My advice: find the answers to those questions. There is a good movie to watch (namely, An Inconvenient Truth), that really sends an honest message across (I think).

In any case, don't just say something like "oh, my. I'd really like to know, I just can't seem to find out how." If you say something like that, all it means is that you aren't trying, just trying to make others think you are.

#57 Re: Dark Discussions at Cafe Infinity » Wink Murder 11? » 2007-07-03 03:32:09

Yes, anyone can play.

Actually, i was referring to the fact that I'm going to be (mostly) away from any Internet connection for about 3 weeks... hope you don't start before then.

#58 Re: Puzzles and Games » lightning's spelling Bee » 2007-07-02 08:47:48

There's still two of mine that no one's bothered to answer... I wonder why.

#59 Re: Dark Discussions at Cafe Infinity » Global Warming scenarios » 2007-07-02 08:44:06

Just because you can apply the same thought process to something completely different doesn't make it a scam, does it?

Just as Ricky said, there is pretty irrefutable evidence that global warming is happening. The flies around here, which usually aren't born until late September, are already almost full-size. The plants around here started blooming in March, even at 2000 m above sea level, where I am. The birds have been here since late February. Something is seriously wrong with the climate here.

#60 Re: Dark Discussions at Cafe Infinity » LEGO Challenge » 2007-07-02 08:32:56

Actually, it may be quite a while longer until I send the vid. The device is not quite complete, and I'm flying back to the US Wednesday. Unless I finish it tomorrow, the video will have to wait 'till the end of August (unless I have room to pack the stuff needed to finish it...)

Detail to the "rules" : it doesn't have to be fully automatic, it just hast to have a relatively high rate of fire. Also, the 1-meter fire distance is following the following criteria: the front end (the end where the pieces come out) may not be at more than 30 cm off the ground. The setup may be placed at any angle. The rear end must be in contact with the ground.

My current setup has a "cartridge" containing up to 11 shafts, but I could make it bigger, and so can anyone else.

The challenge will end on new year's day (my time: according to the forum, +3)

#62 Re: Puzzles and Games » lightning's spelling Bee » 2007-07-01 18:55:52

Better. What about the others?

17 pay per rap hur
18 comp ack 'tis kree duh

#63 Dark Discussions at Cafe Infinity » LEGO Challenge » 2007-07-01 18:51:12

Laterally Speaking
Replies: 7

I challenge anybody with sufficient LEGO pieces to do the following: construct something able to fire #4 shafts at a relatively high rate of fire. The device must be able to launch them at least 1 meter. You may use seven rubber bands, at the most, for the mechanism. There will be little judgment on the aesthetics of your device. There will not be an actual prize, either, so don't pull your brains out.

My device is already almost complete, and I'll post a video of it in action as soon as I can.

#64 Re: Puzzles and Games » Primes » 2007-07-01 04:24:33

Here's a prime, but probably not the next one: 46809563

#65 Re: Dark Discussions at Cafe Infinity » Global Warming scenarios » 2007-07-01 04:16:16

Also when certain governments tell them to...

Here's a more sensible explanation as to why global warming can cause global cooling: If the temperatures rise, more water will evaporate. More clouds will form, so, after a while, there won't be any sunlight coming through at all, unless the air at high altitudes gets too hot for the water to condense, which would be very bad.

Also, here's why the ozone layer is disappearing: ozone, O3, is highly unstable at room temperature. It will turn into O2 quite violently if brought to room temp. However, at very low temperature, it is relatively stable. The heating of the air at high altitudes has caused the ozone there to turn to oxygen.

#66 Re: This is Cool » Do you want to participate in a competition? » 2007-07-01 04:04:48

It may be an ad, but it is related to maths or science. Besides, it isn't like they're asking for money.

#67 Re: Euler Avenue » Small numbers and measures » 2007-06-30 20:04:18

ganesh wrote:

And the largest? The distance of the most distant QUASAR in nanometers! Or picometers!

How about in yoctometers?

The smallest: the distance traveled by an object, moving at 1 yoctometer per yottasecond, in one yoctosecond.

#68 Re: Dark Discussions at Cafe Infinity » Global Warming scenarios » 2007-06-30 19:59:29

About my analogy: I wasn't really thinking straight, so it isn't (for the most part) true.

Wouldn't "the most un resisteable poison ever" kill humans, as well as just about all other life? The thing is, whatever we do to "prevent" what's happening is dangerous to something, therefore, to humans. Dumping poison, bacteria, iron dust... is not good for the health of the planet.

The last ice age was caused by the changing orbit of the planet. Every 100000 years, the orbit becomes far more elliptical, thus moving the planet away from the sun, causing a cooling. However, the current imbalance is due to humans putting vast quantities of greenhouse gases into the air, killing off thousands of species every year, and clearing large forests. The entire ecosystem is no longer a system, because we humans didn't care as much about the planet as our getting rich.

#69 Re: Help Me ! » URGENT Probability Problem!!!! » 2007-06-30 19:42:05

3-- If you have only one chance of getting it right, that part's pretty simple. As for the total number of combinations, you could figure it out like this: for the first pick, there are 27 balls to chose from. For the second, there is one less ball to pick. For the third, there is yet another ball missing.

#70 Re: Puzzles and Games » lightning's spelling Bee » 2007-06-30 00:15:21

Sorry, you have one too many syllables, perhaps two, depending on how you pronounce it...

#71 Re: Dark Discussions at Cafe Infinity » Global Warming scenarios » 2007-06-30 00:13:28

Well, yes.

You see, global warming can cause global cooling.

#73 Re: This is Cool » World’s fastest supercomputer launched » 2007-06-29 06:15:10

Really? They actually managed to make a small quantum computer? Impressive.

Like I said, people started writing programs for them before they were made, which isn't very logical, or easy.

#74 Re: Dark Discussions at Cafe Infinity » What shape is the universe? » 2007-06-29 04:23:36

I suppose that, if matter is not expanding uniformly, there wouldn't be an obvious center, but there would still be an area from which most matter is departing (at the very large scale, ei: galaxies, clusters, etc.).

#75 Re: This is Cool » World’s fastest supercomputer launched » 2007-06-29 04:13:09

There's still a way to make a computer faster (theoretically). The name of the concept is a "quantum computer". It would work in the following (general) way:

You have a bunch of subatomic particles, corresponding to a binary code.
You do not observe these from the outside of the machine during the whole process.
You give the particles a jolt of electricity such that you cannot be sure, unless you check, whether they have switched direction.
The idea is that, since you don't know what state the particles are in (spinning one way or the other), they can be in both. Using this "fact", the computer then does the calculations programmed at the same time, for any possible combination. This is most useful for cryptography.

Unfortunately, nobody seems to be able to make a quantum computer, but several people have already made programs that would work for such a processor, confident that someone will manage to make a Q.C.

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