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/sci/ Science & Math

Threads added between 2015/12/02 and 2015/12/09

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Most viewed threads in this category

10 more posts in this thread. [Missing image file: ]
Can anyone tell me why is my homemade electrolysis happening so slowly? I've poured a metric fuckton of sugar and stirred vigorously, connected batteries ranging from 1.5 to 9 volts, got some good wires, and after an hour all I got is a 4mm bubble of gas and a very hot battery.
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Why might a genetic resistance to antibiotics not go to fixation in a bacterial population? This question was on a test I had at the beginning of this semester. I said that the genes for antibacterial resistance might be recessive, or that the population wasn't exposed to antibacterial agents all at once, preserving some of the individuals without the genetic resistance. I got the question wrong, and the teacher didn't give me a correction or explanation, so I'm pretty confused. What do you think, /sci/?
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what does a single neuron want, /sci/?
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Hey neuro/sci/, can you tell me what kind of interfaces there exist between a particular skeletal muscle and the cortex? In pic related there is the Ia sensory neuron, which increases or decreases its rate of fire as the rate of change in muscle length increases or decreases. I'm also aware of the type II sensory fiber, which increases or decreases its rate of fire as the muscle length itself increases or decreases. Interesting how both l (muscle length) and dl/dt are being monitored, but is this the whole picture that the cortex gets of arm kinematics (other than visual cues) or is there anything keeping track of the actual exertion of the muscle for monitoring cases like increased load bearing? The way it's described in the video, the Ia sensory neuron is the only one implicated in the circuit involved in a myotatic reflex, but there must be more to the picture if things like the goal encoding (that the arm actually WANTS to be kept at the same angle) is to be accounted for, or am I mistaken?

Pic-not related.

3 more posts in this thread. [Missing image file: ]
Yo, going to college in like a month. We can have pets, but only aquarium pets. What are some good and cool looking fish/shell fish, I can put in an aquarium? Scientifically tho.

Your field of study's culture

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What is the culture like in your field, /sci/? Especially/preferably if you are at the graduate level or beyond.

Putnam Exam

26 more posts in this thread. [Missing image file: ]
Who here also /putnam/? I'm kinda freaking out. I'm a junior and this is my first year taking it, and I didn't prep at all because I was lazy. I'm looking at practice problems now and I'm hardly coming close at all to a correct answer. I suppose there's always next year.
5 more posts in this thread. [Missing image file: ]
0, 1, 1, 2, 2, 3, 3, 4, 4 ... what is the function for that numbers ? sorry for my bad english, i'm not sure if function is the right word. I mean f(1) =0, f(2), f(3) = 1, whats that function ?
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What kind of pets does /sci/ have?
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How does /Sci feel about this "new college"? https://www.youtube.com/watch?v=6rT00QXqZak


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Who /biomech/ here? Has anyone read up on load bearing exoskeletons for walking? It sounds like they'd be useful for labor and physical jobs if they're scaled down to more compact designs http://biomech.media.mit.edu/#/portfolio_page/load-bearing-exoskeleton-for-walking/

Curvature or Warpage?

8 more posts in this thread. [Missing image file: ]
I'm a physics noob and I have a dumbass question. What's the difference between curvature of space-time, and warpage of space-time? Is it the same shit but different words?
25 more posts in this thread. [Missing image file: ]
Mars. Crazy scientist man rants about why we should go there: https://www.youtube.com/watch?v=plTRdGF-ycs Full video: https://www.youtube.com/watch?v=EKQSijn9FBs Have some pics.

Math anxiety?

6 more posts in this thread. [Missing image file: ]
https://en.wikipedia.org/wiki/Mathematical_anxiety Why is calculus so depressing? It's supposed to be simple as fuck, yet I'm sitting here looking at the tasks our prof gave us and it only makes me want to jump out the window. I never liked math, but was fairly good at it, but the jump between high school and this is just insane. I'm sweating, can't focus on a single thing for longer than 10 seconds and my stomach feels like it's going to implode. What the fuck is happening to me? Did I just reach the limit of my intellectuals capabilities? I don't want to be retarded, I think I'm gonna be an hero. Did /sci/ feel the same on their first year?
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Does weed help studying?
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Earth rotates at 0.465km/s (at the equator) Earth revolves at 30km/s Sol revolves at 230km/s The milky way is traveling 583 km/s through the universe. The Milky Way and Andromeda are also converging at 112 km/s If you live to be 100 you will have lasted one minute longer than someone who lived to be 100 and had no velocity with respect to the cosmic background radiation. Hurrah for us, we be time traveling.
31 more posts in this thread. [Missing image file: ]
Nowadays, it takes a student at least five years of university to learn enough about Mathematics to engage in research. Do you think there will come a time where research has advanced so far that it would take one ten or twenty years to get to the necessary level of knowledge? Once there is so much information even in one specific branch of mathematics that it takes a whole lifetime to understand it, progress is no longer possible. Do you think that will ever happen?

How do rockets move in space when theres nothing to push against?

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In solving this second-order linear ordinary differential equation, I can understand all, but the very first step, in which they "assume a solution will be proportional to e^(?x)". Why can they assume so?
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Anyone here a member of Mensa? What's the admission process like? Are there perks beside the feeling of exclusivity?

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