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/sci/ Science & Math

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Most viewed threads in this category

19 more posts in this thread. [Missing image file: 1391513073888.jpg]
Does differentiating both sides of an equation preserve equality? Does integrating both sides of an equation preserve equality?
50 more posts in this thread. [Missing image file: 1391665155221.gif]
Why do so many people say that people who hurt themselves doing things like putting their hand into a blender are stupid? Another thing they say is that they are a "Darwin award candidate". It is always remarked with an air of superiority and of a tacit obviousness of the danger, as in "oh WOW, they are SO stupid, how COULD they do this???" I've never put my hand into a blender but I imagine if I did it slowly, the blades would tickle my fingers as they whizzed past, just like they would if you put your fingers into a computer case fan, or an electric toy fan. So why is it suddenly "so stupid!" when someone does it to a blender? Why is everybody expected to know when they are going to hurt themselves? It seems that, ironically, its the people who are calling other people stupid, who are the stupid ones. Because they seem to imply that everybody at all times has a constant awareness of what will or won't hurt you. Which is obviously wrong, otherwise accidents would not happen. Nobody would ever trip and fall on a slippery surface, or bump their head after standing up quickly on a bus with a low ceiling. They seem to think that everybody, everywhere, has already experienced a minor episode of the specific occurrence and should thus know the implicit danger in everything. But perhaps the most idiotic thing about this trope is that it seems to imply people should not experiment with anything. That the people sitting on a computer watching accidents on Liveleak are somehow better off than the people experiencing these accidents and learning from them. "WOW. Look at these stupid kids jumping off cliffs into water" they say, before reclining back into their chair and popping another soda.
2 more posts in this thread. [Missing image file: Accidental Shelf.jpg]
Question about math/engineering. I'm trying to use NMF matrix for recommendation. So I have large sparse training data and a user vector. Do I just insert the user vector and complete the matrix to figure out the empty sparse entries for recommendation?
77 more posts in this thread. [Missing image file: 1387047283538.jpg]
>tfw thanks to the war on drugs and the war on terror you'll never get a chance to go to space
6 more posts in this thread. [Missing image file: 275px-HAtomOrbitals.png]
Could someone explain to me the main difference between Flourescence and Phospherescene? I mean i don't understand why the spin multiplicity changes in the case of Phosphorescence
7 more posts in this thread. [Missing image file: mckenna.png]
Suppose we have a coin that when tossed results in heads with probability {math}P{math} , and tails with probability {math}1 - p{math} . Let {math}X{math} be the number of times that we need to toss the coin until {math}r{math} heads are obtained. What is {math} P( X = n ) {math}

pineapple metabolization

41 more posts in this thread. [Missing image file: Pineapple_2.jpg]
Im not sure what board this should go on, its not food or fit so Im going to try here. ADULT CONTENT HO!!! My wife read that drinking pineapple juice would make my semen taste sweet, she says Im too salty atm so shes got me on this only pineapple juice for drinks diet starting today. Anybody out there know how long it takes the human body to metabolize pineapple juice to make my semen sweeter? alternately does this shit have ANY bases in scientific fact? or is it all womans mag bullshit?

I suck at logical thinking.

24 more posts in this thread. [Missing image file: untitled.gif]
>Go to Cryptokids website. >Go to Brainteasers. >Think, "Oh it's for kids, this should be easy." >Fail everything except for "That's Odd". >Hope to win a chance to go on a plastic surgery or extreme workout show, so I could at least be a himbo or a strongman.
0 more posts in this thread. [Missing image file: white-noise-single.jpg]
Wich econometric program you guys think is the best ?? someone told me that EViews is very good, but i`m having a hard time finding it...
30 more posts in this thread. [Missing image file: image.jpg]
"Free" energy thread I'm still on baby-tier physics so I'm just gonna sit here and listen to what you autists have to say.
18 more posts in this thread. [Missing image file: 1newfbmessage.jpg]
If you're so smart, why don't you make loads of money?
7 more posts in this thread. [Missing image file: space_tank.jpg]
Riddle me this /sci/. Why the fuck are we sending wheeled vehicles to mars where there's no roads? Did the engineers working at NASA never seen a tracked vehicles and its off road capabilities? For fucks sake the wheeled rovers have to move at a snails pace to avoid every bullshitting rock in the way and at least one rover got its wheel stuck and broken. There's absolutely no reason not to use them, the only plausible thing would be because it would increase the weight of the vehicle but then again we have more than enough capability to get it over there and seeing as a tracked rover would be much faster and reliable it would be well worth the cost, and it's not like were not sending bigger and heavier things in comparison to what we did 50 years ago. So, space tanks when?
4 more posts in this thread. [Missing image file: Ocean_Energy_Application_(...).jpg]
I'm curious about /sci/'s opinion on hydrokinteic power, specifically wave and tidal. Seems like some cool opportunity for innovation, but most of what I've seen are just modified wind turbines dumped in the water. Is this just a game or is it something worth investing time and energy (punnnnn) in? Seems like some biomimicry would be in order for ocean-based systems, not the clunky engineering I've seen.
17 more posts in this thread. [Missing image file: 1391656907352.gif]
>you roll an n-sided die >n is anywhere between 9 and 999 >you only care about the leading digit of the rolled number, ie. 2 in 24, 3 in 31, 4 in 4, etc >you want to guess correctly with the highest chance of success the leading digit, which number yields the highest rate of success? Which the least? Is this something I should be able to answer in a first year stats/combinatorics course?

Let's test your math

7 more posts in this thread. [Missing image file: amc1.jpg]
Questions from the AMC for 12th graders time! Let's see who can get them. They will get harder This is 19 out of 25. One of my favorites from this year There are exactly N distinct rational numbers k such that |k|<200 and 5x^2+kx+12=0 has at least one integer solution for x. What is N? (a) 6 (b) 12 (c) 24 (d) 48 (e) 78
1 more posts in this thread. [Missing image file: 1390323113991.jpg]
Hello /sci/ I have been doing some research for some reactor courses I am taking next semester. Something interesting came to my mind, but I can't find anything like it. Does anyone know if there are materials/paints that will change colour when exposed to radiation? Any help would be awesome!
25 more posts in this thread. [Missing image file: HumanBrain.jpg]
If everything we see and hear and touch and smell and taste and feel is basically electrical signals sent to our brain through our nerves or whatever, wouldn't it be possible to "hack" into this nerve network by introducing electrical signals from inside our body, in effect making us see, hear, touch, smell, taste things that appear to be outside our body but which in fact are not? Then how can we tell that everything we experience does not originate from inside our body, as in how can we tell that we do not have a device inside us that sends all the electrical signals to our brain to simulate the world around us? You may say that people have been dissected over the years and we have found no such device in them, but precisely if we do have such a device in us then this device could make us see/hear/touch/smell/taste anything it wants, and so it could make us see an organ or whatever instead of the device, and when touching it it would feel just like an organ. Worse than that, if a thought is a certain pattern of electrical signals in our brain, then a thought could be artificially generated as well just like everything else we experience. I have spent years trying to understand the universe and yet this only dawned upon me just now. How do you keep pursuing knowledge when you realize this?

Need help. Economics

3 more posts in this thread. [Missing image file: image.jpg]
Hey /sci/, my economics professor gave use this equation and he said the name of it but I can't remember it it'd help me out a lot if someone knows the name of the formula. (Ref. pic)
18 more posts in this thread. [Missing image file: gold-nanotech-2.jpg]
What does /sci/ think about nano technology?
2 more posts in this thread. [Missing image file: 138869642720.jpg]
ITT stupid/elementary questions you're too embarrased to ask in real life/too lazy to properly look up yourself. How do we know we got all the quantum numbers of the atom already? What if there are more?

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