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/sci/ Science & Math

Threads added between 2013/04/17 and 2013/04/24

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Most viewed threads in this category

22 more posts in this thread. [Missing image file: ap b physics.jpg]
What profession do you think has the most intelligent individuals /sci/? I'm in medicine and I can safely tell you most of these people are completely fucking retarded outside of anything that has to do with it. Hell, alot of them are completely retarded in things that have to do with medicine. The classes are structured to pass standardized exams that are written by old fucks from 80 years ago on diseases so rare they might as well not exist. 80% of all medical problems can be solved by eating right and exercise and 10% are so serious the best they can do is try to add a few years onto life using drugs they're not even sure of the mechanisms of. But behold the wonders of a free market! I've gone way off track ...
13 more posts in this thread. [Missing image file: image.jpg]
Is Schrödinger's Cat the same as the "If a Tree Falls in the Woods" theory?
12 more posts in this thread. [Missing image file: interestin.jpg]
Any cramming tips? I have a calculus test tomorrow, and I started studying today. Didn't really get much studying done and now I need to cram. Any tips? Calculus I at the University of Illinois at Urbana-Champaign btw, if it matters.
5 more posts in this thread. [Missing image file: shower[1].jpg]
I always hear that you shouldn't waste water by leaving the taps running when you're brushing your teeth or to shut off the shower while you scrub yourself to save water for the environment but why does it matter? I live in Chicago so all my water comes from Lake Michigan. If I "waste" water it just goes back into Lake Michigan through sewers and eventually back into my house, doesn't it? Should I worry about hurting the environment by taking long showers?
7 more posts in this thread. [Missing image file: image.jpg]
Can somene explain elasticity to me? Whats going on at molecular level?
12 more posts in this thread. [Missing image file: image.jpg]
I read somewhere that bandages should be changed regularly so that wounds don't heal them into the body. That got me thinking: How much can wound healing be manipulated to form flesh outside the body? Can we put a sponge made of chemically inactive material over a wound and watch as flesh starts growin over the sponge outside the body?
3 more posts in this thread. [Missing image file: url.jpg]
Do you guys know of any YouTube channels with educational videos? Something dynamic like this http://www.youtube.com/user/minutephysics
2 more posts in this thread. [Missing image file: yumyumkitty.jpg]
I know this is a topic that's brought up every week, but I've been picking up an intro to analysis book every time I'm in the math library, and I have free time, it's a pretty solid book (the author escapes me) but was wondering if there's anything in particular I should keep an eye out for. This is just real analysis, obviously.
5 more posts in this thread. [Missing image file: space shuttle challenger.jpg]
>2013 >Family try to talk science with you >Ask about dark matter dark energy and other things we know very little about. >Ask why dark matter/energy exists.. Do you ever get the feeling it's nice people are interested but you can't answer their questions and that you're a let down? I also tried to tell them that the why something exists and does what it does question isn't really a great question because it presupposes an inherent meaning but they didn't accept that. Anyone got similar family experiences where they try to sound interested in your studies?
20 more posts in this thread. [Missing image file: Untitled.png]
Ok /sci/ can someone please tell why this won't work? Simply attaching device that generate electricity and using that to power a car. I know that normal batteries get their current from this. Is it too expensive to manufacture these hi-tech batteries and/or devices? Is this already in process? Does the technology to enable this as a possible option not exist yet? This has probably been asked before so sorry about that. Maybe it hasn't, I don't know. Anyways thanks if anyone replies.
0 more posts in this thread. [Missing image file: bayes net.png]
If the delay in a half adder is 10 ps, what is the worst case delay in a 32 bit ripple carry adder made from such half-adders? pic unrelated.
38 more posts in this thread. [Missing image file: galleries_member_5173ee85907ea67a78(...).jpg]
Hello scientists! I was wondering, does any medication exist that replicates the socializing effects of alcohol, but without the tripping down stairs and vomiting?
20 more posts in this thread. [Missing image file: IMG_20130424_154807.jpg]
Hi /sci/, are some electrical engineers around? I could use some help with an excercise. I want to calculate the total capacitance of the circuit. But I can't get the correct result. Could you please help, finding a solution?


4 more posts in this thread. [Missing image file: images-1.jpg]
You have $24,000 to invest in a stock portfolio. Your choices are Stock X with an expected return of 13 percent and Stock Y with an expected return of 12.0 percent. If your goal is to create a portfolio with an expected return of 12.65 percent, how much money will you invest in Stock X and Stock Y?
22 more posts in this thread. [Missing image file: Exam-Stress.jpg]
Since you guys are probably the most familiar with this idea... What would be the most efficient way to study between Now (Apr 22, 8pm) and my Exam time (Apr 24 1pm)? I have lots of coffee and Dexedrine. It's more about understanding and internalizing so I'd imagine i'd have to be in a coherent and functioning state. posting/reading as i study
10 more posts in this thread. [Missing image file: drooling_homer-712749.png]
I am an idiot. I can't understand how the chi square test works. I understand levels of significance and I know vaguely what the result of the test means, but I don't understand: a) what the purpose is of squaring a random variable or the sum of random variables to produce a chi squared distribution is b) I don't understand why the chi square test formula works. I guess I'm supposed to just look at the formula and understand it like most people but I am just clueless. How do 2 squiggly lines and a table full of values produce a result that allows you to make inferences based on data. When it comes to maths I feel like I have part of my brain missing. Everyone else seems to pick up things much more quickly than I do. I also understand that chi square is pretty basic. How fucked am I if I want to continue learning statistics?
16 more posts in this thread. [Missing image file: rationals-countable.svg[1].png]
Given: Between any two real numbers there exists a rational number (Proof: http://www.math.usu.edu/~rheal/math4200/class_material/irrationals%20between.pdf) Given: The rationals are countable (picture related) Therefore the reals have at most 1 higher cardinality than the rationals. If not, there would be two reals with no rational between them. Therefore, the reals are countable. QED
0 more posts in this thread. [Missing image file: 1365747645115.png]
hey guys please help an 18 year old high school out I have finals in biology this friday and I know all of it except for protein-synthesis because I've been sick for the last weeks and thus I hadn't had the opporunity to learn it from someone who knows it. I tried asking my friends but they all sucked. So, can someone here explain protein synthesis in an understandable way? would be nice if you used analogies and such. Pretend that I am close to retarded. In return for your help take this motivational picture.
0 more posts in this thread. [Missing image file: 1341383867100.jpg]
What do you think of online courses from universities? I'm going to do the Stanford finance one which will start any second (although you can enrol anytime) and the technology entrepeneurship one looks interesting. I'll also do more economics and maths related ones in the summer when I don't have actual university work >http://online.stanford.edu/courses Are these actually good, or is it just plebcore stuff? Is anyone else doing these and want to do the group parts together?
7 more posts in this thread. [Missing image file: offset.png]
How do I eliminate the DC bias?

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