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/sci/ Science & Math

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Most viewed threads in this category

79 more posts in this thread. [Missing image file: images.jpg]
what's the best adderall alternative that's legal without prescription? adrafinil? noopept? piracetam? come on /sci/
2 more posts in this thread. [Missing image file: Bluehound.gif]
Does anyone know the book "Optimization over Integers"? Is it available as a pdf somewhere?
0 more posts in this thread. [Missing image file: 1354599859762.jpg]
What was Richard Feynman's GPA as an undergrad?
13 more posts in this thread. [Missing image file: Hypercube.gif]
Does math exist inherently in the universe just waiting to be discovered or is it a creation of the human mind? http://www.youtube.com/watch?v=TbNymweHW4E I thought this was interesting, though I will withhold from making a judgement because i don't know dick about things. What are your opinions?

Help?

3 more posts in this thread. [Missing image file: IMG_2807.jpg]
Hey /sci/ how would i go about taking the data in this two way table and calculating the marginal distribution of gender (in percents)?

terraforming Venus

31 more posts in this thread. [Missing image file: 3131101631_0af37027a1_o.jpg]
is it possible to use genetically engineered extremophile bacteria to act as a grey goo in order to terraform venus in the future? if I remember correctly (may be wrong, if I do please correct me) the only reason we have oxygen in our atmosphere is because the early life forms in earth disposed it as a byproduct in the process of using carbon dioxide to create sugars as an energy source. and I know that there are bacteria that can divide in a matter of minutes. and I know that there are bacteria that can survive extreme conditions called extremophiles. so is it possible to genetically engineer an extremophiles bacteria that will divide so fast it will basically act as a grey goo to dramatically change the dominant atmospheric elements in Venus in a matter of years or decades in such a way that it will be hospitable to human life?
4 more posts in this thread. [Missing image file: im so god at math.jpg]
I feel like there are a lot of holes in my mathematical knowledge due to not caring and simply memorizing how to do certain problems in school. Is there some sort of site that has an exam I can take to see where the holes in my understanding are? Or some other resource? I checked the sticky, and I suppose I could go through books in each subject until i find things I don't understand and then study them, but that's rather inefficient. Anyone else have/ever had this problem?
16 more posts in this thread. [Missing image file: 1375483755866.jpg]
What the fuck are tensors?
21 more posts in this thread. [Missing image file: ]
I come before you seeking your advice, /sci/. I am determined to grow my foreskin back (thank you, American heritage), though I see two (perhaps three) possible ways for which to do this. (1) The first would be to begin a tugging/stretching regime that would last 1 - 2 years before the foreskin would regenerate, though the results would likely be suboptimal; doing this would not regenerate two key structures: the frenar band and the frenulum, both of which are very sensitive. Resultant of the inability to grow the frenar band back, a restored foreskin typically has unnaturally thick or messy- looking "lips" that enclose the glans. >Picture unsafe for work: http://oliver.prygotzki.de/privat/einsichten/circumcision.html What is nice about this though is that nerve endings ARE restored within the foreskin itself, and the glans become MUCH more sensitive after it decalcifies, which is the bulk the sensation anyway. (2) The second option would be to wait for research to be completed so that the foreskin could be regenerated in its complete form. Such an option would be optimal, though the downside is the uncertainty as to whether a technique would be devised soon enough (within 5 to 10 years). I'd like to know when might this procedure be available before I commit, and I'd kind of like to have my foreskin back while I'm still young (I'm currently twenty years of age). The third might be going through the time and effort of tugging to restore the foreskin by using approach (1), and then completely restore it (whole with frenar band and frenulum) once/if a procedure arises. I'm uncertain of this though because the methodology will probably be specialized for those who haven't tried to manually regenerate their foreskin, so I don't know if I'm excluding myself to approach (2) by initiating (1). Well /sci/, what do you think I ought to do? Do you guys have any information as to when something like "Foregen" will come to fruition?
50 more posts in this thread. [Missing image file: gurdon_postcard.jpg]
Which science is harder: biology or particle physics?
48 more posts in this thread. [Missing image file: Observable_universe_logarithmic_ill(...).png]
What lies beyond the universe /sci/? Since it has been said that it is expanding, then the universe is expanding into what? Is the universe making new spaces as it expands?
156 more posts in this thread. [Missing image file: WZ_Erwin_Schr%C3%B6dinger[1].jpg]
>yfw casuals are acting like they knew who the fuck Schrödinger was before google put his cartoon up today
24 more posts in this thread. [Missing image file: ERt9ACR.gif]
The other day I accidentally wrote a number theory problem that nobody I know can solve. Can you guys solve it please? Find all integers a, b such that a^2+b^2 is a square (pythagorean triple) and that (a^2+1)/(2a^2+2) is the square of a rational number (eg. 4/9, 8/18, 1/25 etc.) pic unrelated I would be so grateful if you could solve this.
215 more posts in this thread. [Missing image file: image.jpg]
What does /sci/ think about this? >http://www.youtube.com/watch?v=AzE_IHGUssY Apperently, the Egyptians couldn't have built the great pyramid using their technology. It also shows the mathematical beauty of it(pi and the golden ratio appear often), which is contradictory to our current beliefs about Egyptian mathamatics. Also, they somehow knew the meter and were able to make perfectly symmetrical faces on statues using rocks and chisels. I just want an engineers perspective of this.

Solar system

8 more posts in this thread. [Missing image file: Space-Art-Wallpaper-space-7076586-1(...).jpg]
Hi /sci/. I'm writing a novel which includes highly modified Sol. Sun is 14% lighter, Moon's (52% lighter) orbit is circular perpendicular to the line between Sun and Earth and Jupiter, its year is as usual 28 days. Earth orbit is circular and it's in L1 Lagrangian point of Sun-Jupiter (kept stable). I tried to make a program that predicted when the Moon is visible, but it turned out quite complicated. Are there any tools to do it easier? Any tips, at least?

Babby problems

8 more posts in this thread. [Missing image file: 550x486xgtfo-im-doing-science-naked(...).jpg]
p-please help /sci/ I'm struggling with a few differential equations questions and would greatly appreciate some guidance. So i'm trying to find equations in terms of Q dQ/dt=(m-n)Q , m=0.1, n=0.06, Fairly certain I ended up with the right thing Q=200e^t/25 My actual trouble was with the DE: dQ/dt=(m-n-kQ)Q , m=0.1, n=0.06, k= positive constant Any points in the right direction would be greatly appreciate. And yes, I already know this is sub-babby tier.
14 more posts in this thread. [Missing image file: Hairstyles_for_Balding_Men_4.gif]
What can be done for it? I hear taking DHT suppressors works/slows it down.
4 more posts in this thread. [Missing image file: Planck2.jpg]
Which scientist do you believe has the classiest glasses and has made significant scientific contributions to STEM pursuits? >pic related My nigga Planck.

incredible stupid question

4 more posts in this thread. [Missing image file: sin.png]
if you move the point M along the AC line, then the lengths of BM and MA changes, which means that sin, cos, and tan of angle A also changes, even if the angle A is the same all time. I feel like an idiot now for not understanding what's wrong.

Some spaceflight news

8 more posts in this thread. [Missing image file: grasshopper_day.jpg]
http://www.youtube.com/watch?feature=player_embedded&v=2t15vP1PyoA Maneuverability is the them for this video.






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