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/sci/ Science & Math

Threads added between 2014/01/23 22:00 and 2014/01/24 04:00

15 more posts in this thread. [Missing image file: Untitled.png]
so, /sci/ im curious about this test http://www.mbti123.com/iq/en/ i already complete it, and my score is 140 can people solve this?
49 more posts in this thread. [Missing image file: 1311609266762.jpg]
I have a theory that homosexuality is a disease symptom. It is likely that there is an as-of-yet undiscovered pathogen that is responsible for the homosexuality epidemic. This pathogen infects young males before puberty and interferes with their sexual development. Hormone levels cause your morphology to develop into that of a typical man. The homosexuality pathogen blocks the hormone receptors responsible for driving the male sex drive during puberty towards female sexual characteristics. Thus, the infected male does not develop an attraction towards females. However, since he can still orgasm and get release from ejaculation, he will go out and have sex in the pursuit of pleasure. Because men are not as picky as females with who they have sex with, the male is able to have sex with other men often. By frequently having sex, its pleasure is invariably diminished and the men will go looking for more extreme ways to get off, i.e. having sex with little boys. Through intercourse, the male infects the young boy. The pathogen alters his developmental physiology so he too becomes gay and can spread the virus further, further perpetuating the cycle. All of this is evidenced by the fact that: -Molested kids are more likely to turn out gay1 -Disgust is an evolutionary adaptation to avoid pathogens.2 Disgust of homosexuals (poorly named 'homophobia') is genetically inherited, suggesting that homophobia is an evolutionary advantage.3 -Also evolved is a fear of letting your kids near homosexual people.4 Your thoughts on my theory /sci/? Especially any contradictory evidence you can find. 1.http://www.sciencedirect.com/science/article/pii/0162309596000428 2. http://rstb.royalsocietypublishing.org/content/366/1563/389.full.pdf+html?sid=275d049a-24a0-4299-a8c2-2f13925190e1 3. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2292426/ 4. http://www.sciencedirect.com/science/article/pii/0162309594000286 Mods: This post isn't against any global or board rules. Do not delete this.
6 more posts in this thread. [Missing image file: facebook-doom.jpg]
apparently, facebook will go down, analogous to how an infection dies out according to kermack mckendrick model http://www.telegraph.co.uk/technology/facebook/10589169/Facebook-could-lose-80pc-of-users-by-2017.htm i've modeled this in SIMULINK with three differential equations under the following assumptions: >there are 6'000'001 people on the planet >at t=0 there is 1 Facebook User >at t=0 there are 6'000'000 potential Facebook Users >at t=0 there is noone that used to be on facebook in the past. >the more facebook users and potential facebook users there are, the bigger the probability that potential facebook users will notice facebook and create an account >the average facebook user deletes his account after X years >eventually, everyone will have created and deleted their facebook account these assumptions lead to the following differential equations >dPotentialFbUser/dt = -1 * PotentialFbUser*FbUser*gamma, PotentialFbUser(0)=6'000'000 >dFacebookUser/dt = PotentialFbUser*FbUser*gamma - ExFbUser*tau >dExFBuser/dt = tau*ExFbUser I posted this on /g/, but since /g/ only cares about waifu desktops and battle station, i thought some people might want to discuss this here... any thoughts from /sci/ ? How would /sci/ improve my model?

Wolfram Appreciation Thread

15 more posts in this thread. [Missing image file: 12597856490801.jpg]
>child prodigy >wrote three books on particle physics by the age of 13 >by 15 he began to research in applied quantum field theory and particle physics and publish his first scientific papers >published his first paper on Nature at 17, widely cited >his work on the theory of the strong interaction is still used today in experimental particle physics >has an Erd?s number of 2 >has an h-index of 58 >created Mathematica and Wolfram|Alpha >millionaire > A New Kind of Science >has an element that is actually found in nature named after him you will never be as alpha as Wolfram
4 more posts in this thread. [Missing image file: Jellyfish.jpg]
I am in Physics 20, missed a class and im fucked. We have a graph of Velocity vs Time, and we have to solve distance using slope and area formula not kkinematics formula. I looked online googled this formula and it is always y2-y2 x2-x1 Which just gives me slope, how the fuck do i solve for distance by not just going Velocity times Time?

/sci/ podcasts

5 more posts in this thread. [Missing image file: podcast.png]
Hey /sci/, I believe it'd be better to listen to some physics or mathematics podcasts while I drive around, instead of music. Could you recommend me some that won't be talking about concepts I'm absolutely not familiar with? The extent of my knowledge in math is calculus BC and an AP physics B course in high school. Thanks
67 more posts in this thread. [Missing image file: 1389397154852.gif]
>Professor from India >Can't understand what he says >Miss 75% of the information he puts out >Study on own >Still lose fucktons of easy points (i.e. go to this website do this shit) over gay ass admin bullshit >LOL ITS YOUR FAULT HE PUT OUT HE INFORMATION It's-not-my-fault-I-did-poorly-in-that-class general?
14 more posts in this thread. [Missing image file: Textbooks.jpg]
Do you guys buy textbooks? I downloaded older editions of all of mine online but it feels weird having to read a textbook on my laptop and a little less productive. But at the same time I'm saving $400... How should I feel
9 more posts in this thread. [Missing image file: Aloe_Vera.jpg]
Anyone know of anything I can do with Aloe? I've considering using the gel as the base material for a synthetic wax but I'm not sure how. Anyone done anything to monetize or make aloe otherwise productive?
7 more posts in this thread. [Missing image file: abacus2-1.jpg]
Do any of of you people know how to use one of these? Math is not my best subject, but I feel as though i'm too dependent on a calculator. Would this even be useful in a course like physics or calculus or is a calculator just plain better?
2 more posts in this thread. [Missing image file: JimmyNeutronscreen.jpg]
how can you calculate the number of moles exposed on a surface of paraffin, like the inside of a tube of it
11 more posts in this thread. [Missing image file: earth_atmosphere-660x627.jpg]
Shit. So watching vsauce videos made me think about this. The earth is an Oblate Ellipsoid (wider at equator), right? So does the atmosphere take the same shape? Ignoring the fact that the earth is technically a Geoid since the atmosphere is fluid, would it take a more spherical shape than the hydrosphere/lithosphere?
10 more posts in this thread. [Missing image file: really2.png]
http://www.youtube.com/watch?v=w-I6XTVZXww This video claims that 1+2+3+4... = \frac{-1}{12} and that the result is useful in string theory as well as other, more esoteric, branches of physics. Some of the things this guy does (specifically (1+1-1+1-1+1-1+-1+...)-(1+2+3+4...)) stuff seems a little fishy... Also, the claim and result seem so weird.. I mean, 1+2+3+..+n= \frac{n(n+1)}{2} Your thoughts? In the comments he links to another video which shows a proof using the Riemann Zeta function
2 more posts in this thread. [Missing image file: 81d30e50d965b99d08ac30ff3(...).png]
What's your opinion about Vandermonde interpolation
15 more posts in this thread. [Missing image file: 1380910276316.jpg]
Is nuclear fusion energy possible in the future? Sorry if this is a meme I've never been on /sci/
4 more posts in this thread. [Missing image file: 320px-CollatzConjectureGr(...).jpg]
What is the simplest way to notate the Collatz Conjecture without the use of words? I'm trying to figure out how to write it out in a purely mathematical notation, but I'm not sure if I'm getting it right or not. Pic related. It's some cool ass shit the Collatz Conjecture does.
31 more posts in this thread. [Missing image file: ab.jpg]
Hey /sci, I was wondering, why do I have to pass Algebra to graduate high school? Just wondering why an almost straight-A student such as myself is probably going to be unable to graduate high school over not being able to pass Algebra. Is algebra so important that I shouldn't be able to go to college or accomplish any of my dreams without mastering it?
1 more posts in this thread. [Missing image file: Untitled.png]
Hello /sci/, Can anyone tell me what this is called? Also, is there a program which would allow me to input it and compute experiments? I tried searching the 'mandelbrot set' but that seems to be infinite -the tree goes on and on forever; this one seems to stop at a certain point. TLDR: If I want to mess around with this idea of trees, networks, branching etc,,, what's the math and how can I build them?
9 more posts in this thread. [Missing image file: 800px-IBM_5100_-_MfK_Bern[1].jpg]
So, has John Titor ever succeeded in getting the IMB 5100?
2 more posts in this thread. [Missing image file: 1387563341307.jpg]
Can someone properly explain to me the pre exponential factor in Arrhenius Eqns? "the frequency of the molecules/atoms vibration" isnt really cutting it for me
6 more posts in this thread. [Missing image file: viscosity.jpg]
Is there a way to calculate viscosity required to uniformly suspend particulates in a liquid?
3 more posts in this thread. [Missing image file: image.jpg]
0 more posts in this thread. [Missing image file: toro.jpg]
Where do you dufaces stand on Zeno's Paradox? Is space discrete or continuous? According to Wikipedia the answer isn't clear yet, and there's still much debate.


3 more posts in this thread. [Missing image file: catapultas-medievais-10.jpg]
I would like to request a history answer. What was the avarage speed of an medieval army? Around 1200. And thee avarage speed of an roman army, in their imperial age?
3 more posts in this thread. [Missing image file: polymer.jpg]
Is there a way to calculate properties (like melting temp, hardness etc) of given material, knowing only what particles is it made of? Lets assume someone has made totally new substance from few (two, three) elements. Is it possible to calculate its properties without actually checking them empiricaly?
5 more posts in this thread. [Missing image file: 459a2340-d572-4e46-a886-4(...).jpg]
How far off are we from thought input similar to a keyboard or a mouse?
7 more posts in this thread. [Missing image file: m_jpg0225f1.jpg]
What is your opinion on the field of Evidence Based Medicine? I've seen some physicians revere it like it's the gospel of God and others hate it like the plague. I think it's super useful and medicine has advanced pretty far with it but has some critical limitations that cannot and won't be solved in ever.
5 more posts in this thread. [Missing image file: 1368558986785.jpg]
can anybody recomand a good online course / book for propability? my professor is lacking them teaching skillz

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