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/sci/ Science & Math

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Most viewed threads in this category

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.
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/?

help

2 more posts in this thread. [Missing image file: descarte.jpg]
For any 3D vectors a,b,c, prove that (axb)xc lies in the plane of a and b
10 more posts in this thread. [Missing image file: 300px-World_line.svg.png]
Hi, /sci/! I am not particularly versed in physics, but my unscientific mind's WTF detector went off when I read books on Special Relativity. Could you help me understand this better? I have several questions. 1. Tying space-time to speed of light. SR assumes (amirite?) that before we observe the event, it doesn't happen. I don't understand why it was so absolutely necessary to not regard time as an absolute value. One second passes on Earth = One second passes in a different planet elsewhere = one second passes near inside a black hole's sphere of influence. Does information pass with the speed of light? Yes, but it doesn't mean that the flow of time is related to spread of information. 2. The book I read the last made a big point of an impossibility of calculating absolute velocity of a celestial body. Buuuuut don't we have speed of light as that absolute constant? Why couldn't we calculate our absolute velocity by sending radio signals to six different relays, positioned at the same distance from transmitter and recording time when these signals arrive? 3. Time dilation. The most WTF concept for me. 4. Impossibility of traveling faster than light being based on it violating causation laws. I imagine the situation as: Event A occurs at point B. Observer is based in point C, which is 1 light year away from point B. Dude D is on point B, witnessing A and going to tell Observer how fukken cool it was. D has a drive that allows him to travel two times faster than light. So. Event A occurs. Half a year later D arrives to C, telling of an event. Another half a year later D and Observer can see the event occurring while being on C. Where is the problem? Even if FTL was instantaneous, how could it ruin cause and effect link, or help travel in the past? Well, all of it boils down to "why the hell time is not an absolute value in SR?".
24 more posts in this thread. [Missing image file: homos.jpg]
Could it be possible that, rather than being a genetic "mistake", homosexuality and asexuality are necessary biological adaptions to overpopulation? Certainly a species' goal is to populate itself, but there is also a point where it has reached a certain limit. In humans, I think it is quite possible that limit has been reached.

Probability

1 more posts in this thread. [Missing image file: 35lwnq.jpg]
A Chinese buffet opens at 2:00 pm, if the owner leaves every day at 10:30 to get food, and is expected that he gets back in about 2:30 hours, and that food gets done in about 1 hour. What is the probability that food is done exactly at the time of the opening, if the owner arrives at the expected time, 15 minutes earlier and 15 minutes delayed? I thought the following: Let X be the "time taken to the owner to get food measured in hours" and Y be the "time taken to prepare food measured in hours" thus X \sim Exp(\lambda = 2.5) and Y \sim Exp(\lambda = 1) Then the probabilities wanted are: \Pr{(Y=1|X=2.5)},\Pr{(Y=1.25|X=2.25)}, \Pr{(Y=0.75|X=2.75)} How do I explicitly calculate with a formula \Pr{(Y=y|X=x)} ?
17 more posts in this thread. [Missing image file: SatelliteOnly[1].jpg]
Sup /sci/ I'd appreciate some wisdom about now. 150 kg satellite is in a circular orbit 100 km above the earth. After 1000 revolutions it has descended by 8 km. Calculate the magnitude of the friction force. This question should be solved using E = mv^2/2 - GMm/r Where m is the satellite mass and M is earth's mass, r is the orbital radius, and v is the satellite's velocity.

WHAT THE FUCK

4 more posts in this thread. [Missing image file: 1350716895145.gif]
Has this guy been debunked somewhere? cathodixx.com he tries to refute special relativity and the copenhagen interpretation he also claims to have discovered room temperature superconduction wtf...

rich hoffman, weatherman/dildo

5 more posts in this thread. [Missing image file: hoffman1.jpg]
this man is a disgrace to all meteorologists.
21 more posts in this thread. [Missing image file: tumblr_meguykqaWz1r6m2leo2_500[1].jpg]
BREAKING: Two blockaders - Glen Collins & Matt Almonte - have barricaded themselves inside the Keystone XL Pipeline to protest its inevitable environmental destruction. Police are threatening to lift the pipe to remove them and to bring in canine units, as well as tear gas them out of the pipe. “Doing so would cause serious harm or even death; Matt and Glen are locked between two barrels of concrete which weigh over six hundred pounds each.” “I’m barricading this pipe with Tar Sands Blockade today to say loud and clear to the extraction industry that our communities and the resources we depend on for survival are not collateral damage,” said Collins, another blockader inside the pipe and an organizer with Radical Action for Mountain Peoples Survival (RAMPS) and Mountain Justice, grassroots campaigns in Appalachia working to stop mountaintop removal coal mining. Thoughts? Opinions? How bad is the Keystone pipeline for the environment?
20 more posts in this thread. [Missing image file: new1.png]
What are some countries that will profit from global warming?

Documentaries

8 more posts in this thread. [Missing image file: 137397.jpg]
Give me some good documentaries, anon. About astro/quantum physics. Please and
9 more posts in this thread. [Missing image file: nri891-f1.gif]
/sci/ I know very little about our immune system. My girlfriend's brother has type 1 diabetes, which he developed early in his childhood. The doctor told the family that a previous trauma he recieved to the head could have caused it. This leads me to; how does the brain interact with our immune system? Does it have any input or say on what or how to produce a specific type of antibody?
22 more posts in this thread. [Missing image file: abxyr.jpg]
I was bored at work the other day kicking around this one in my head. Suppose there's a circle with radius r in the first quadrant. Consider the two lines tangent to the circle which pass through the origin. What's the most effective and elegant way of determining the coordinates of the points belonging to each line that are tangent to the circle? Is calculus required?

Chemistry help

3 more posts in this thread. [Missing image file: cool background.jpg]
I am a sophomore in an honors chemistry class and I have a question to ask for anyone who can answer. When writing the equation Se + O2 = SeO3, I could not understand why the product of the reaction was SeO3. If anyone could explain this it would be greatly appreciated.
9 more posts in this thread. [Missing image file: DirichletFunction_1000[1].gif]
Sup /sci/, I need some help. Define f:[0,1]->R by f(x) = x if x is rational and 0 if x is irrational. Show f is not riemann integrable. I am stuck.... I have been looking at it for two hours now.

9-5+5x0+3

9 more posts in this thread. [Missing image file: 16000_445737655486175_1936311348_n.jpg]
9-5+5x0+3 answer this

precalc

7 more posts in this thread. [Missing image file: 1353531383071.png]
given 5 tan(x)=5 Then what's tan(x)? Is it 1? I have to find sin, cosine, and tan of (x/2).
10 more posts in this thread. [Missing image file: aint-even-mad.jpg]
What is this bullshit behind OMNI-HEAT in clothing http://www.columbia.com/Omni-Heat-Reflective/Technology_Omni-Heat_Reflective,default,pg.html There is no "light" under your cloth, what the fuck does it reflect?
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






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