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/sci/ Science & Math

Threads added between 2013/08/07 and 2013/08/14

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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?
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.
15 more posts in this thread. [Missing image file: 12386361-high-tension-line[1].jpg]
can high-tension lines cause cancer?
15 more posts in this thread. [Missing image file: Capture.png]
How do you deal with this shit /sci/, people who say the earth is young
1 more posts in this thread. [Missing image file: sqc.png]
How would you solve this ?
48 more posts in this thread. [Missing image file: polynomialrootssmall.png]
I saw a thread like this the other day and it looked pretty fun. Ask a soon-to-be pure math PhD student anything and I'll try to answer.

Code

1 more posts in this thread. [Missing image file: Code.png]
#TheLight - Are you #Smart enough to #Crack this #Code? Private message the answer on YouTube! The Light - http://youtu.be/0j9XCLN17es

Infinite-Sided Barrel Dice

12 more posts in this thread. [Missing image file: ammo_belt.jpg]
I figure this should be an easy question for somebody who's taken a statistics class. Let's say I have two dice, each with an infinite number of sides, with sides ranging in value between 0 and 1, dividing the range into equal pieces of infinitesimal width. If I roll them and add the results, for a given result y=x1+x2, where x1 and x2 are the numbers rolled, what fraction of an uncountably high number of rolls will be higher than the result? For bonus points, how would you go about extending the solution to larger numbers of dice? Love to hear your thought process. The idea for this question came to me when I was thinking about resistor tolerances. I wondered if, given the specious assumption that each actual resistance within the tolerated range was equally likely, putting multiple lower-resistance resistors of the same percent tolerance in series would on average yield a significantly lower variation from the base value than the equivalent higher-resistance resistor. The same thought process could be applied to other basic circuit components as well (inductors, capacitors in parallel etc.)






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