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/sci/ Science & Math

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Most viewed threads in this category

60 more posts in this thread. [Missing image file: bulge.jpg]
Why are straight men sexually attracted to cocks but not to vaginas? What's the evolutionary explanation of this, /sci/?
12 more posts in this thread. [Missing image file: 45345365635.jpg]
Is there any /sci/ence behind eating your own scabs, boogers, or loose/dead skin? And possibly any long term health effects of doing so? Since as long as i can remember i have done everything mentioned above. I'll feel around the inside of my mouth with my tongue and then chew and swallow any loose pieces of skin. I like to bite off any dead skin around my fingers and chew on it for awhile. If i have a scab that's loose i'll pick it and eat it. I also dig around and eat my boogers. Sucks when you get a hair but i find the juicier the better... As gross as it is, i have always been curious about it.
4 more posts in this thread. [Missing image file: plato.jpg]
Science is subjective and published articles for journals should contain an extra cover note consisting of; the reasoning behind the review, current state of mind, etc. Discuss.
2 more posts in this thread. [Missing image file: 1335776335938.jpg]
I'm looking for a design to make a shirt for the physics society at my university. Does anyone have any ideas for physics-related humour that would make sense on a shirt?
0 more posts in this thread. [Missing image file: 376728_513512402009327_2045094520_n.jpg]
I need help! Given a right circular cone, you put an upside-down cone inside it so that its vertex is at the center of the base of the larger cone, and its base is parallel to the base of the larger cone. If you choose the upside-down cone to have the largest possible volume, what fraction of the volume of the larger cone does it occupy? (Let H and R be the height and radius of the large cone, let h and r be the height and radius of the small cone. Use similar triangles to get an equation relating h and r.
24 more posts in this thread. [Missing image file: HP_2.jpg]
The Fermi Paradox. It basically states that the reason we have not yet been visited by aliens is because civilizations technologically advanced enough to travel here end up destroying themselves before doing so. Discus.
3 more posts in this thread. [Missing image file: animatedelectrongeometry.gif]
\jewcommand{\t}[1]{\displaystyle{#1 \atop {#1~~#1}}} \t{\t{\t{\t{\t{\t{\t{\triangle}}}}}}}

Erisian Mysteries: The Law of Fives

34 more posts in this thread. [Missing image file: sacred-chao.jpg]
> The Law of Fives states simply that: All things happen in Fives, or are divisible by or are multiples of Five, or are somehow directly or indirectly appropriate to 5. > The Law of Fives is never wrong. Theorem: Almost all numbers have a 5 in them. Proof: For an n-digit number, there are 10 ways to choose the first digit, 10 ways to choose the second, and so on, for 10^n different numbers. If a number cannot contain a 5, then there are only 9 ways to choose the first, 9 for the second, and so on, for 9^n. Then the proportion of 5-containing numbers is p_5(n) = \frac{10^n-9^n}{10^n} = 1-(\frac{9}{10})^n and \lim_{n \rightarrow \infty} p_5(n) = 1 - 0 = 1. QED. Hail Eris, friends.
8 more posts in this thread. [Missing image file: 1328401960235.jpg]
Why do people argue about the nature of the universe when it's all just a computer simulation anyway? http://www.huffingtonpost.co.uk/2012/10/11/physicists-may-have-evide_n_1957777.html

Confidence Intervals

10 more posts in this thread. [Missing image file: 285142_485774804776869_931993389_n.jpg]
Hey /sci/, I'd love some statistics help if anyone feels up to it. Problem: A company tested 100 widgets and found that the average breaking strength among the 100 tested was 250 psi with a standard deviation of 50 psi. How confident could this company be when making a prediction that all widgets manufactured will have an average breaking strength between 247.5 psi and 252.5 psi? Having trouble getting started on this and cant find the notes from my last class. I know you start by finding the standard deviation of the sample mean (turns out 5), but I'm not sure how I could use the sample mean or where to go from there.
229 more posts in this thread. [Missing image file: doctor tits.png]
>female scientists respond to accusations that women aren't as good as men in math and science >say that they face discrimination in the industry because they're women >and that they need affirmative action Why can't I hold all this rage? https://www.youtube.com/watch?feature=player_embedded&v=rtZCq83v92s
4 more posts in this thread. [Missing image file: temp.png]
Trying to learn Mathematica. I tried to solve the logistic equation numerically (pic related). Why isn't the plot working?
8 more posts in this thread. [Missing image file: 299423_10151410833854966_1241385857_n.jpg]
hey hey hey, ive been wracking my brain and think it broke. so long story short i'd like help please. so the question is: What is the major product which results when (2R,3S)-2-chloro-3-phenylbutane is treated with sodium methoxide in methanol? i believe that the mechanism for this reaction is EN2, since a strong base is present (methoxide). also EN1 would lead to a methyl shift and sn1 and sn2 wouldnt result in any of the supplied answers (its multiple choice) i went through the problem and have the correct product and only one product can form because there is only one hydrogen to enable anti elimination. the phenyl groups agrees with the h group on the opposing side of the double bond. naturally this leaves the methyl groups in agreement with each other since the butene group is planar. HOWEVER i am told that the answer is (Z)-2-phenyl-2-butene. for this to work the methyl groups in agreement with each other myst take priority over the phenyl group and that doesnt make sense to me. can anyone explain?
0 more posts in this thread. [Missing image file: Double_Sicily_by_HPPD.jpg]
http://www.youtube.com/watch?v=xzTHjlueqFI So what is the chance that we can actually start re-terraforming the deserts of the world (most of them man-made due to shitty agricultural practices for thousands of years on already shit soil) and what effect would it have on climate change? By spreading forest around wouldn't that combat the increasing carbon in the atmosphere by trapping it in trees and the ground?
6 more posts in this thread. [Missing image file: einstein.jpg]
I didn't know where else to post this but.. I have a macbook pro. Just now, i lost control of my mouse and all my programs (on my dock) starting opening up. I freaked the fuck out and shut my laptop, waited a few seconds then opened it again. Wtf happened. Paranoid me thinks someone is using a wireless mouth to fuck with me lol
27 more posts in this thread. [Missing image file: fetal-postion.jpg]
>one more semester left of college >realize I haven't learned anything >the total sum knowledge I've learned over the past four years could be gained by one day of intensive internet research >i guess just studying real hard before the tests then forgetting it all after wasn't that great of strategy after all Holy fuck I'm scared
1 more posts in this thread. [Missing image file: marie.jpg]
Hey sci hypothetical question how many babies would I have to throw off a cliff before they evolved wings and antural selection picked the ones that could fly to safety

1,4 Cycloadditions

9 more posts in this thread. [Missing image file: cycloadd.png]
Hey /sci/ I have a question about the 1,4 cycloaddition (diene + dieneophile) for organic chem. I understand the underlying theory of primary and secondary orbital interactions during the transition state when you add the reagents in my picture (too lazy to name) that causes the endo product to be favoured. However, is the endo product ALWAYS favoured when you have a 1,4-cycloaddition reaction? Pic related, its the reagents to the reactions.
11 more posts in this thread. [Missing image file: Edward_Witten.jpg]
/r/ing Thomas' Multivariable Calculus, any edition. Will bump with stuff until then.
10 more posts in this thread. [Missing image file: 1355122905410.gif]
Applied Math Major here, trying to figure out classes I should take. We're told to take classes from a wide variety of topics (obviously) and I'm already taking Physics and CS. I'm going to need more credits to graduate and I'm wondering what would be the best subject to take? I'm looking at Chemistry and Econ right now, is there anything else I should consider?

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