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/sci/ Science & Math

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Most viewed threads in this category

9 more posts in this thread. [Missing image file: 1292137809179.png]
This is the chemical formula for love: C8H11NO2+C10H12N2O+C43H66N12O12S2 dopamine, seratonin, oxytocin. It can be easily manufactured in a lab, but overdosing on any of them can cause schizophrenia, extreme paranoia, and insanity. Let that sink in.
16 more posts in this thread. [Missing image file: green lex luthor.jpg]
so I'm working through Project Euler (very new to coding), and I'm on problem 3 http://projecteuler.net/problem=3 I have a working algorithm, but the code fails when I use the number, which is too large to be stored in any of the primitive value types (in Java) Is there an easy way to fix this? pls help

Free textbooks

2 more posts in this thread. [Missing image file: f22.jpg]
Does anyone know a website where I can aquire PDF's to textbooks for free, I would look at the sticky but its not a science or math textbook im looking for. So just a website for textbooks in general. In case anyone cares the book im looking for is "Solidworks & Mastercam training guide mill 2d" 6th edition. Pic unrelated.
4 more posts in this thread. [Missing image file: cell.jpg]
How do cells work? Is it just chemical attractions that drive everything? How does some random component floating in the cytoplasm no where to go or how do transport proteins home in on whatever they're transporting then know where to take them? A lot of the textbooks I read make it sound like a conscious decision when the cell responds to some stimuli or changes their genetic expression.
6 more posts in this thread. [Missing image file: ht_facebook_uknown_tomb_soldier_rai(...).jpg]
Can we discuss the correlation between the weather and sickness? I remember when I was a kid, I got pneumonia after going out on a long bike ride during a light rain, hearing stories about how getting sick from cold and wetness was just a superstition and reasoning that it wouldn't harm me. Recently I contracted the common cold after walking around the house naked after a shower without properly drying myself and with wet hair (i'm hikki so i doubt i caught it from somebody else). Then I read stories about William Henry Harrison who died of pneumonia after delivering an hours-long inaugural speech in the rain, and the examples of people going sick as a result of low temperature are numerous. I refuse to believe that the connection between being cold/wet and illness is just an old wives tale. Whether the cold lowers the body temperature which causes a weakening of the immune system, or cold air drying the internal walls of the respiratory system making it more susceptible to germs - I don't know what it is. I'm not a fan of anecdotal evidence but when it's present in such overwhelming amounts I'm starting to have my doubts. Almost every culture on the planet has some myths involving sickness being caused by weather conditions, weather it's "masuk angin" (bad/cold wind) in Indonesia or to "catch a cold" and its varieties in Europe, the general gut feeling that there is a connection seems widespread. Can we get scientific on this?

Aerogel engine

4 more posts in this thread. [Missing image file: image.jpg]
Guys what if we lined the engine cylinders with aerogel? More of the energy of the fuel would be output in heating the air inside the cylinder and so more energy would be output by the engine instead of wasted in heating the engine. It would also reduce the energy needed to cool and maintain the engines temperature. Why aren't we doing this.
8 more posts in this thread. [Missing image file: All_in_the_mind[1].jpg]
Do minds have gender?
1 more posts in this thread. [Missing image file: Motor.jpg]
Project Statement: The machine shown in the figure is rigidly anchored on a rigid concrete block and the mass of both is 3000 kg. The block has height h = 1 m and square horizontal section with a = 1.2 m and is supported at the corners by springs of stiffness k = 2000 N/m. i)Derive the two dimensional equations of motion of the system using both Newton’s law of motion and Lagrange’s equations methods. ii)Find the natural frequencies and mode shapes of the system using both hand calculations and Matlab (you can also use SAP2000/ADAMS. iii)A 200-kg mass falls on the middle of one edge of the block and stayed in contact with it. Neglecting the change in the mass, determine the resulting motion. iv)If the block is isolated by layers of elastic materials in a rigid concrete base. Design the isolation if the machine has parts that rotate at 250, 500, and 1500 rpm. v) If there is unbalanced mass of 0.1 kg on the machine at a distance of 0.25 m from the axis of rotation and angular velocity of 1750 rpm. Find the resulting vibration.
4 more posts in this thread. [Missing image file: Vrillon.gif]
It's 46 anniversary of Vrillon incident. http://www.youtube.com/watch?v=6BWHVmBY0Cs What are you thinking about it?
8 more posts in this thread. [Missing image file: bagshaw_stone_dance.jpg]
Just in theory is one object with infinite energy collided with an identical object with infinite energy going at the speed of light what would happen?
12 more posts in this thread. [Missing image file: neutron_star_1_2[1].jpg]
Astronomy is the best kind of science The entire field is fucking amazing

mold

7 more posts in this thread. [Missing image file: IMG_00000039.jpg]
Sup guys, I need some rational thought here. I'm working at the store I manage this morning when I notice this mold on the ceiling. I proceed to call my boss who says they've seen it and because it's dried it safe. This is pretty contrary to my understanding of spores, can anyone identify this or give me some advice? I'm about to lock up and go home.
7 more posts in this thread. [Missing image file: Irwin.png]
http://www.realfarmacy.com/28-signs-that-the-west-coast-is-being-absolutely-fried-with-nuclear-radiation-from-fukushima/ This shit was posted by a friend on Facebook this morning. As someone who actually studies chemistry, this load of horseshit makes my blood boil. First off, the author cites "high levels" cesium-137 as evidence that our fish are being irradiated. First of all, cesium doesn't spread to other species like mercury, and has a half-life of around 70 days. That is to say, it doesn't travel well from fish to humans, even if levels were high enough to warrant alarm. Also, the fact that walruses and polar bears are losing hair or migrating could be very well chalked up to seasonal changes, climate change, hereditary reasons, etc. Correlation doesn't equal causation. The author outright lies when he talks about the "California-sized cloud of radiation" that's heading towards the West Coast. There is radiation, yes, but by the time it reaches the coast, it will have lost much potency and its size will be diminished, if not completely irrelevant. There are so few downsides to nuclear power that when something like this happens, environmental fundies start acting like we're in a game of Fallout where shit just magically mutates and we all become irradiated by living on the West Coast. But go ahead and read it for yourself. Tl;Dr: Environmentalists are fucking retarded.
8 more posts in this thread. [Missing image file: 1382601299923.png]
I'm a general math major and was considering switching into applied. The applied math major at my uni is the exact same as the general math but it has a few extra math courses. If I want to go into grad school for pure math will they view me as less qualified even though I'll have done the same pure math classes?

Space Engine

8 more posts in this thread. [Missing image file: TheMagnificentBastard.jpg]
good evening fellow /sci/ friends. Do anyone of you know the software called Space Engine? If so, I was wondering if all the system there are real. Anyone knows? I find many systems I never heard of.
1 more posts in this thread. [Missing image file: beautiful scientist.png]
Guys, what are some significant online course sites? I understand there's more than a few out there made for nations and people without convenient access to education but I'm afraid I've lost the list for them and I'd rather enjoy knowing what's the best out there.
13 more posts in this thread. [Missing image file: panic-button[1].jpg]
Britfag here, applying to University for 2014. I'm unsure whether I ought to do Mathematics or Physics. I was good at both in school but I'm concerned that I'm not as strong at math as I'd need to be for a proper undergrad Math course. In my A-Levels I got an A* in physics, an A in maths and a B in AS further maths (self-taught because of schedule constraints). Would I be able to handle university Math? Also either way I want to improve my math ability. What kind of stuff should I be studying? I'm just finishing a Coursera course on complex analysis and the Functional Analysis and Statistical Mechanics ones starting in January look pretty interesting. Will these be useful? What textbooks should I consider?
3 more posts in this thread. [Missing image file: Complete_graph_20.png]
why do complete graphs have a triangular number of edges?
4 more posts in this thread. [Missing image file: Theresa Heath.jpg]
Can someone please explain special relativity to me. I'm having trouble getting my head around Einstein's train example.
1 more posts in this thread. [Missing image file: cross the road.jpg]






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