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/sci/ Science & Math

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Most viewed threads in this category

12 more posts in this thread. [Missing image file: dale_gribble.jpg]
How come ethanol is soluble in water.....but octane is not? That's always confused me. They're both forms of gasoline.
2 more posts in this thread. [Missing image file: logo_v13.png]
I need some books to introduce me to precalc, calc 1 and calc 2, they must be short so I can read them in two weeks, but I should be able to ace too.
13 more posts in this thread. [Missing image file: 1324601369129.jpg]
So anyone here in Hard Science or engineering? How many hours a month do you spend on "fun". Like gaming or reading or other things people do for fun as students.
2 more posts in this thread. [Missing image file: linux-christmas.jpg]
I only hear about building desktops. Is it possible to build a laptop?
5 more posts in this thread. [Missing image file: 1387166822152.jpg]
Maybe a chemistry guru can help me out. I'm set to receive some chrome plated brass things tomorrow, and I have to clean them when I get 'em. I was reading that cleaning in tap water will fuck it up because tap water is a "weak electrolyte" or something and screws up the brass for the same reason stainless steel will eat away aluminium. I have an ultrasonic bath I was gonna clean them in, but no distilled water. How can I make distilled water? Is there any other material you can think of that would be a good alternative?
6 more posts in this thread. [Missing image file: tmp_13866635242551144487414.png]
>make thread about electronics problem >detail how I reached my wrong answers >provide correct answers found by brute forcing >ask how you'd find the correct answers for better understanding >it's not even homework, but prep for a lab today >thread deleted within 5 minutes after single answer Meanwhile >whats this squiggle mean >does free will exist >1 vs 0.9999.. >calc 1 Janitor confirmed for 12 years old. Fuck you.
0 more posts in this thread. [Missing image file: v.jpg]
https://www.youtube.com/watch?v=3WzHXI5HizQ This is really depressing, somehow. >tfw chances of becoming a space pioneer/rocket engineer are almost zero
3 more posts in this thread. [Missing image file: mongool.jpg]
So there's this mathematical structure in which self-aware substructures exist. Would the mathematical structure need to somehow be simulated or run or exist in its entirity in some physical form for these substructures to experience their form of life? Or is the mere possibility enough?

Ether from starting spray

5 more posts in this thread. [Missing image file: hemuli.jpg]
What additives could be in diethyl ether based starting spray? There was no other ingredients listed, unlike in some other brands so I doubt there are hexanes or other hydrocarbons, and there was no other smells than the typical ether smell. However it left a small oily residue when it evaporated, so it can't be 100% pure. Could it be some kind of lubricant or antioxidant? I hope it's not very toxic.
23 more posts in this thread. [Missing image file: 2013-12-01_00002.jpg]
I work in a small company in Melbourne with a 50 year old voluntary human extinctionist, and we often get into debates about whether or not humanity will (or should) become space faring. He believes that humanity is a virus that should never leave Earth, and I try to tell him that if we manage to reach other planets then we have earned the right to live on them. What do you think /sci/? Will we be able to put our differences aside for long enough to actually make it off Earth properly? Would it be a mistake for Humanity to spread? All we seem to do is fuck things up, but at the same time isn't sentient life worth killing for?
3 more posts in this thread. [Missing image file: in_the_courtLG4.jpg]
Hi y'all. I'm trying to make a speech recognizer, just to learn some new stuff. Right now I'm able to record sound in 8-bit unsigned signal. I get a normal soundwave like you'd expect. Now my question to you: how can I transform the signal to get an array of values which is a more clear representation of sound than the data I get right now. Right now, when I whistle, I get a smooth signal with a constant period, which is good for analysis. When I say something like "aaaaaaa" on the other hand, I get a pretty scrambled signal. Right now, I want to get an (almost) constant collection of values which represents me saying the letter "a". Thanks in advance! Pic unrelated.
8 more posts in this thread. [Missing image file: Untitled.png]
ITT: Formulas that give surprising insights.
3 more posts in this thread. [Missing image file: asd123.jpg]
How can i make this into a sine function? Not homework, just studying for exam and i wanna learn the answer
10 more posts in this thread. [Missing image file: image.jpg]
I was on YouTube trying I to find out about orbital mechanics involved in orbiting binary stars and came upon a playlist talking about our own sun being part of a binary star system somehow. The playlist description talks about the government hiding info and the average IQ today being 80 so naturally opinion discarded. But is there any possibilities of our sun being in some kinda binary system? I don't understand them too well P.s. If anyone can find info about orbiting around binary stars they're encouraged to post it, could you orbit their COM with a semi major axis less than each star?
6 more posts in this thread. [Missing image file: mice524.jpg]
http://www.teslatech.info/ttstore/report/articles/v3n1art/scope.htm Twelve mice were placed in a cage to be used as controls (untreated). Another twelve mice were placed in a separate cage with exposure to the South pole field of a 2000 gauss magnet, and the last twelve were put in a cage exposed to the North pole energies of a like magnet. An equal number of males and females were put in each cage. Exposure time was two months. The untreated control mice behaved and functioned as normal mice. Without exception, the South pole mice slowly became very messy in their housekeeping, their appetites increased, they engaged in sex more, and their offspring were larger than those of the controls. Also, as time passed, they became mentally slow, loosing sensitivity to sound and light changes in the laboratory. Their young were difficult to teach the customary tests; they were lazy, listless, careless and very dirty in appearance. The North pole mice became very neat and tidy, cleaning themselves frequently. They also became extremely sensitive to any noise or light variations in the laboratory. Their offspring were smaller than those of the controls. They were mentally superior to the controls and out performed the South pole young by several hundred percent in all phases of natural behavior. The South pole mice were larger, grew faster, matured sooner, and mated continually. They also died earlier than their control counterparts. The North pole mice matured slower and lived 45 to 50 percent longer than the controls. They were also mentally superior to the controls and several hundred percent smarter than the South pole mice. They were much less frequent with sexual behavior than the South pole treated mice and less than the controls.
1 more posts in this thread. [Missing image file: ITER-CrossSection.gif]
Hey /sci/ doing some reading up on the very basics of plasma and fusion stuff for a university interview (the university specializes in this kinda research) so i'd like some help understanding the process of fusion. All i can seem to find online is that when the tritium and deuterium fuse there is a loss in mass and using E=mc^2 we can say this mass difference produces energy. How does the mass come to be lost? also if someone can tell me about what low temp plasma/high density plasma is and how they come about that'd be really helpful. Cheers
1 more posts in this thread. [Missing image file: Anti-spiral_post.png]
http://sdu.dk/en/Om_SDU/Fakulteterne/Naturvidenskab/Nyheder/2013_12_12_collapsing_universe Should we have listened to the Antispirals, /sci/?

Secret message

2 more posts in this thread. [Missing image file: cisco_disco.png]
Hi I got this message in a puzzle game but I can't figure out what the answer should be. I think i've found a clue on the puzzle site: "It said CULTURE with capital letters along the books back" http://pastebin.com/DqBuupN6 I would be very grateful if anyone could help me out. Thanx in advance! :)
3 more posts in this thread. [Missing image file: nuclear-explosion-abstrac(...).jpg]
Random thought exercise here, /sci/. What would happen if you put *all* the world's fissile material into one bomb? Would you even be able to detonate it? What would happen if you did?
28 more posts in this thread. [Missing image file: 1384555566386.gif]
Hey /sci/, something interesting for you neuroscientists/psychologists There is a specific pattern that a portion of the population taps their fingers in - they haven't read about it anywhere, haven't even seen anything related to it, yet they still somehow know it. The pattern is: >left right right left >right left left right >right left left right >left right right left Which translates into this sequence 0 1 1 0 1 0 0 1 1 0 0 1 0 1 1 0 http://en.wikipedia.org/wiki/Thue%E2%80%93Morse_sequence Do you have any idea why so many people are doing exactly the same fractal pattern? Here's the /x/ thread I saw earlier, which kinda opened my eyes since I myself also do that pattern since like 6 years old (ignore the soviet stuff) http://archive.4plebs.org/x/thread/13852675/






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