## Search found 48 matches

Wed Feb 15, 2012 10:58 pm UTC
Topic: 1017: "Backwards in Time"
Replies: 75
Views: 20524

### Re: 1017: "Backwards in Time"

I'm pretty sure his inverse formula is wrong. Shouldn't it be T minus e cubed? There's a double-subtraction in the original T= formula.
Mon Apr 04, 2011 12:47 pm UTC
Topic: 0881: "Probability"
Replies: 326
Views: 105148

### Re: 0881: "Probability"

Worthless comic! XKCD nerd cred draining!
Sat Jan 22, 2011 11:20 pm UTC
Topic: 0850: "World According To Americans"
Replies: 712
Views: 170722

### Re: 0850: "World According To Americans"

This comic doesn't seem plausible. Egypt / Saudi Arabia are super easy ones. Spain, France, and Germany at least should be there too.
Sat May 22, 2010 12:31 am UTC
Forum: Science
Topic: Starting Campfires in Fun and Exciting Ways
Replies: 17
Views: 5140

### Re: Starting Campfires in Fun and Exciting Ways

The solution presented was to take a barrel and layer the paper in it with nitrate fertilizer, which acts as an oxidizer. According to the paper, the barrel will be glowing bright-red after a few minutes. Make sure you read the instructions in their entirety before destroying them in a fertilizer f...
Sat May 22, 2010 12:21 am UTC
Forum: Science
Topic: What happens to the open-system entropy when it rains?
Replies: 4
Views: 1555

### Re: What happens to the open-system entropy when it rains?

Well there's only so much energy in the atmosphere from the sun. Presumably all those roaring winds and clashing air currents are diffusing that energy, increasing entropy and leaving you with nice calm air
Mon Jan 11, 2010 5:19 am UTC
Topic: 0687: "Dimensional Analysis"
Replies: 159
Views: 62861

### Re: "Dimensional Analysis" discussion

Google doesn't have anything nice to say about the units as given by draco18

oops, g is not gallon! it works with gal.
Mon Nov 02, 2009 1:17 pm UTC
Topic: 0657: "Movie Narrative Charts"
Replies: 337
Views: 146702

### Re: "Movie Narrative Charts" Discussion

I like the black veiny orc flow. Looks like this Atlas of Middle Earth I have
Thu Sep 03, 2009 1:34 am UTC
Topic: 0631: "Anatomy Text"
Replies: 270
Views: 78535

### Re: "Anatomy Text" Discussion

Guy_At_A_Keyboard wrote:Am I the only one who read "HEY!" and heard it in Navi's voice?

Hell I hear "*random beeping noises*" as Simon tones
Wed Sep 02, 2009 6:02 pm UTC
Topic: 0631: "Anatomy Text"
Replies: 270
Views: 78535

### Re: "Anatomy Text" Discussion

Steve the Pocket wrote: And wanted to hang a lampshade on it.

No oh god NO
Literally my browser now
Thu Aug 13, 2009 4:59 pm UTC
Forum: Logic Puzzles
Topic: The Devil's Quarter Game
Replies: 87
Views: 39463

### Re: The Devil's Quarter Game

I would say that the devil places a quarter such that the quarter is centered on the center of the table. If he does this, then it is impossible for your to perform a move that he cannot mirror, by placing all of his quarters such that your last move, the center of the table and his quarter are col...
Sat Aug 08, 2009 12:58 am UTC
Topic: Trials should not be publicly known until they resolve
Replies: 15
Views: 2329

### Re: Trials should not be publicly known until they resolve

zug wrote:It only takes one jury to hang a juror.

Sat Aug 08, 2009 12:51 am UTC
Topic: 0620: "Wings"
Replies: 141
Views: 35483

### Re: "Wings" Discussion

knight427 wrote:leaving you with no counterweight to slow your decent.

It took me a minute to decide this is accurate. I was missing the fact that the counterweight does work against gravity
Tue Jul 28, 2009 1:27 am UTC
Topic: 0482: "Height"
Replies: 271
Views: 72469

### Re: "Height" Discussion

I can't believe nobody got the Snoop Dogg reference.. at least, the topic search doesn't turn anything up, and I think this is the reference. The Snoop Dogg bust made by the unfortunately-named Busts-R-Us plays a somewhat prominent role in Problem Sleuth. Somewhere during their adventure it's lost i...
Mon Jul 27, 2009 5:23 am UTC
Forum: News & Articles
Topic: AT&T censors internet
Replies: 57
Views: 13133

### Re: AT&T censors internet

Kaiyas wrote:Internet censorship is pretty serious business, no matter what site is blocked.

Yes and why would AT&T be the ones in control? Where do they get this idea that telecom companies should control site content?
Fri Jul 03, 2009 8:18 pm UTC
Forum: Logic Puzzles
Topic: My write-up of the "Blue Eyes" solution (SPOILER A
Replies: 1368
Views: 417465

### Re: Suprised this isn't around here somewhere already

Lacan Oh lawd :roll: It does kind of go against the only logical solutions idea behind the problem, but you would surely see your reflection in the sea, and would be able (though not necessarily willing) to take your own eye out. I hope none of them are colour blind. It should probably also be expl...
Tue Jun 30, 2009 11:03 pm UTC
Topic: 0603: "Idiocracy"
Replies: 573
Views: 123516

### Re: "Idiocracy" Discussion

The phrase "dragged IQ scores [down]" or any variant insinuating that average IQ scores change has caused the destruction of more soda cans by me than any other statement. I almost closed the window and never read XKCD again as I read those words in the comic. I gave Randall the benefit o...
Wed Jun 10, 2009 11:34 pm UTC
Forum: Logic Puzzles
Topic: The Devil's Quarter Game
Replies: 87
Views: 39463

### Re: The Devil's Quarter Game

Random832:
Player's first move: (-49.9, 0)

Then the devil plays the middle.
Player's first move: (-0.1, 0)

Then the devil plays -50.

Yeah exact symmetry can be broken but it still works out for the devil if D's initial move is right on the edge of the table. I think. See my spoilered post above.
Wed Jun 10, 2009 1:13 am UTC
Forum: Logic Puzzles
Topic: The Devil's Quarter Game
Replies: 87
Views: 39463

### Re: The Devil's Quarter Game

http://img19.imageshack.us/img19/8917/20354087.png I assume you meant the black move to be on the intersection of triangles like the others, since that seems to be why you used the triangle background. It's an obvious move, basically identical to the other one on the right. Analysis: Now wherever b...
Mon Jun 08, 2009 10:58 pm UTC
Forum: Logic Puzzles
Topic: The Devil's Quarter Game
Replies: 87
Views: 39463

### Re: The Devil's Quarter Game

Anyway he does have a "symmetric" move on the bottom left in your image. You didn't really think that through too well
Thu May 28, 2009 11:10 pm UTC
Forum: Logic Puzzles
Topic: My write-up of the "Blue Eyes" solution (SPOILER A
Replies: 1368
Views: 417465

### Re: My write-up of the "Blue Eyes" solution (SPOILER A

During the time each night while the boat is docked, why can't any one of the people observe that no-one has gotten on in the first half-hour, or the first fifteen minutes, conclude that there aren't N people, and advance the counter without waiting a night? What stops someone from doing this an in...
Wed May 27, 2009 10:48 pm UTC
Forum: Logic Puzzles
Topic: My write-up of the "Blue Eyes" solution (SPOILER A
Replies: 1368
Views: 417465

### Re: My write-up of the "Blue Eyes" solution (SPOILER A

Of course, the guru will probably end up buried somewhere in the brown eyeds, not in the middle. I really don't like the bubble sort. You can do the insertion sort with the only communicated information being a single glance at the end, but the bubble method is a huge feedback loop of countless comm...
Wed May 27, 2009 2:14 am UTC
Forum: Logic Puzzles
Topic: My write-up of the "Blue Eyes" solution (SPOILER A
Replies: 1368
Views: 417465

### Re: My write-up of the "Blue Eyes" solution (SPOILER A

Because it's important that "at least one of the islanders has blue eyes" goes from not common knowledge to common knowledge at a specific point in time. Even if the guru's announcement was predetermined, it'd be important that even if the fact that the guru's going to announce something ...
Wed May 27, 2009 12:12 am UTC
Forum: Logic Puzzles
Topic: My write-up of the "Blue Eyes" solution (SPOILER A
Replies: 1368
Views: 417465

### Re: My write-up of the "Blue Eyes" solution (SPOILER A

Call the brown-eyed person and blue-eyed person at the centre BR and BL. All the blue-eyed people to the side of BL will know they have blue eyes, and leave with the ferry. BL stays because he doesn't know his eye colour. Thus BR knows that he is brown (otherwise BL would have left). And BL knows t...
Tue May 26, 2009 9:31 pm UTC
Forum: Logic Puzzles
Topic: My write-up of the "Blue Eyes" solution (SPOILER A
Replies: 1368
Views: 417465

### Re: My write-up of the "Blue Eyes" solution (SPOILER A

Perhaps we haven't given JayD's idea enough credit. It's wrong but it does bring up an interesting question.. aren't the islanders all human? One of my favorite chapters in GEB was the one about communication. Communication is impossible without making assumptions. We can communicate well with other...
Mon May 25, 2009 8:10 pm UTC
Forum: Logic Puzzles
Topic: My write-up of the "Blue Eyes" solution (SPOILER A
Replies: 1368
Views: 417465

### Re: My write-up of the "Blue Eyes" solution (SPOILER A

I don't know how I can make it any more clear that a group of perfect logicians would be able to arbitrate the 'best' strategy in some way. Best being defined as exerting the least number of steps, etc. I don't know WHICH method they would (all) choose because I am not perfectly logical but there a...
Mon May 25, 2009 6:05 pm UTC
Forum: Logic Puzzles
Topic: My write-up of the "Blue Eyes" solution (SPOILER A
Replies: 1368
Views: 417465

### Re: My write-up of the "Blue Eyes" solution (SPOILER A

"Perfect logician" doesn't mean that they come up with the best strategy, because even a roundabout way can still be logical with no mistakes and no oversights. Nor does it mean that they all come up with the same strategy. And there's no "best" strategy; like was pointed out abo...
Mon May 25, 2009 4:26 pm UTC
Forum: Logic Puzzles
Topic: My write-up of the "Blue Eyes" solution (SPOILER A
Replies: 1368
Views: 417465

### Re: My write-up of the "Blue Eyes" solution (SPOILER A

JayD16: You fallaciously assume that there's a well-ordering of best strategy to worse strategy, and anyway there's nothing prohibiting the islanders from using bad strategies. As long as they always come up with the right answer whenever it's possible, they can use whatever bad strategy they want a...
Mon May 25, 2009 2:55 pm UTC
Forum: Logic Puzzles
Topic: My write-up of the "Blue Eyes" solution (SPOILER A
Replies: 1368
Views: 417465

### Re: My write-up of the "Blue Eyes" solution (SPOILER A

Derive the decision to use your model based on a purely logical scheme by which no other model can be considered equally logical This isn't really accurate. The islanders can use different strategies if they want; they just can't assume the other islanders are using a particular strategy. What they...
Mon May 25, 2009 4:31 am UTC
Forum: Logic Puzzles
Topic: My write-up of the "Blue Eyes" solution (SPOILER A
Replies: 1368
Views: 417465

### Re: My write-up of the "Blue Eyes" solution (SPOILER A

Of course the guru could just tell people the bubble sort algorithm, or stop being such a jerk and just tell people what their eye color is
Wed May 13, 2009 4:57 pm UTC
Forum: Logic Puzzles
Topic: My write-up of the "Blue Eyes" solution (SPOILER A
Replies: 1368
Views: 417465

### Re: My write-up of the "Blue Eyes" solution (SPOILER A

truth: Nope, the solution works even if the guru only speaks once. What would be the point in telling the islanders the same information over and over? Nobody has left the island; if the guru saw someone with blue eyes on the first day and nobody left then obviously she still sees a blue eyed person...
Sat May 09, 2009 6:48 pm UTC
Forum: Logic Puzzles
Topic: My write-up of the "Blue Eyes" solution (SPOILER A
Replies: 1368
Views: 417465

### Re: My write-up of the "Blue Eyes" solution (SPOILER A

Tomace: Remember, the key to the puzzle is the waiting. Everyone's a perfect logician and everyone knows it, so everyone else sitting around and not leaving for a hundred days allows the blue eyes to solve the problem. If someone just leaves on the first day, then the rest don't know anything useful...
Fri May 01, 2009 9:42 pm UTC
Forum: Computer Science
Topic: Resources for learning the Math and Science behind computing
Replies: 45
Views: 96950

### Re: Resources for learning the Math and Science behind computing

@lordlicorice You should check out the Simon Peyton-Jones talk about Haskell. Even though it's stuff you probably already know if you've played with the language, hearing him explain about it just makes it seem .. easier. I'm working through it; great stuff. What's most terrifying is that there's a...
Thu Apr 30, 2009 9:45 pm UTC
Forum: Computer Science
Topic: Resources for learning the Math and Science behind computing
Replies: 45
Views: 96950

### Re: Resources for learning the Math and Science behind computing

I'm "Another junior Haskell programmer". Well, I was; at this point I'm curled up in the corner unblinking and inconsolable until the apocalypse erases mankind's wickedness from the earth. There are some things man was just not meant to know. What has science done?
Thu Apr 30, 2009 9:09 pm UTC
Forum: Computer Science
Topic: Resources for learning the Math and Science behind computing
Replies: 45
Views: 96950

### Re: Resources for learning the Math and Science behind computing

Fri Apr 17, 2009 4:16 pm UTC
Forum: Logic Puzzles
Topic: Three princesses
Replies: 446
Views: 203539

### Re: Three princesses

would both of your sisters give me the same answer to this question? True: "don't know." b/c she has no idea what the random sister will answer Random: "yes" or "no" depending on whether she lied or told the truth False: "don't know" However this does...
Tue Apr 14, 2009 3:12 pm UTC
Forum: Science
Topic: Downwind faster than the wind
Replies: 262
Views: 31809

### Re: Downwind faster than the wind

I just skipped to the last page so forgive me if this has been stated 100 times.. You can not just use your hand. It's in wind, which means once it gets up to wind-speed, there is no wind anymore and it can't continue to accelerate. This is different from the constant force of your hand. I suspect ...
Tue Apr 14, 2009 5:27 am UTC
Forum: Science
Topic: Downwind faster than the wind
Replies: 262
Views: 31809

### Re: Downwind faster than the wind

As people have been asked to do experiments first, then to get theory from them... I thought I'd ad a really simple way to test the device. Take out the wind, and use your hand (as in the example of the wind up toy) If you have any lego etc, build a cart which is powered by turning a handle on top ...
Tue Apr 14, 2009 4:53 am UTC
Forum: Logic Puzzles
Topic: Freecell #25450
Replies: 15
Views: 4561

### Re: Freecell #25450

Generalized question: Any sort of algorithm or consistent rubrick one can universally apply to solve Freecell? Many combinations are impossible, but the of the original 30000 levels only 11982 has proven to be unsolvable by players and programs alike. There are also a few extremely difficult ones: ...
Tue Apr 14, 2009 4:41 am UTC
Forum: Logic Puzzles
Topic: Symbolic arithmetic
Replies: 7
Views: 1904

### Re: Symbolic arithmetic

Mathmagic wrote:
douglasm wrote:
ptmcg wrote:
Spoiler:
( can be 29, 38, 47, or 56.)

Spoiler:
Not quite. It can also be 65, 74, 83, or 92.

Spoiler:
It can't be 29 or 92 because we just found out that is 2.

Uh.
Tue Apr 14, 2009 2:58 am UTC
Forum: Logic Puzzles
Topic: The Sexaholics of Truthteller Planet
Replies: 15
Views: 2755

### Re: The Sexaholics of Truthteller Planet

People are actually trying to solve that tedious tangle? This is "the hardest" of its class only in that it's all but beyond human capacity to solve. Can the really good mathematicians prime factorize 3141592653? Anyone can, but who would want to?