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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: 1360841585372.jpg]
Alpha Centauri (the nearest star) is 4.37 light years away. The Earth is 8 light minutes away from the sun and roughly 4 light minutes away from Mars. 60/8=7.5 7.5 X 24 X365.25 X 4.37 = 287305.65 Alpha Centauri is 287,305.65 times as far away from the earth as the sun. So if it took one day to get from the earth to the sun, It would take roughly 786 years to get to the NEAREST star. FTL when?
2 more posts in this thread. [Missing image file: 136M.jpg]
Ok.. Man from TN Smoky MTNS here.. Look people, I love to star watch ok, every evening I go out to smoke on my deck and just enjoy the stars, Last night was no different, Round 8pm, clear skies. Round 9 it was same Bout 10pm I notice a mega star between two mountain peeks as I do see it quite often but never this close up, after I gazed at it for over 30 mins I called my daughter out to look at it too, it never moved. I woke from a sound sleep about 1am, tossed and turned and finally just got up to go smoke and grab coffee, worst restless night of my life. As I walk out my door I see it again, its closer and still well lit, i'm thinking that's gotta be a satellite or something and I just sit and look up at it. About 3am and my second cup of joe as I look round the skies I notice that same thing but what has caught my eye is that it jerked forwards about 2 miles then stopped, Ok I think to myself, Did that move? As I focused in on it now it moved forwards at a massive speed then darted to the southern top of the mountains and stopped again. 5am now and it flashed a few times then like a freaking super rocket it shot into space and in a flash it was out of sight. Odds are it will be here again tonight. My question to you guys is? Do satellites changes there holding patterns often? Do they drop below the earths atmosphere and hover then return back into a orbit? Please help with advice guys... ty
7 more posts in this thread. [Missing image file: 1377071703084.jpg]
So do you guys think this would be an efficient study method ? Basically I would attend lecture and put down my notes for all the lectures in one big notebook. Then when I would come come I would categorize the notes (and with it re-read them) and copy them into separate notebooks. And I'd use the book if I felt that the notes don't cover enough. I'm asking because this might be a bit too time consuming and not as efficient as I'd hope.
14 more posts in this thread. [Missing image file: Capture.png]
I have a problem. Pic related. Quick question. Thoughts?
17 more posts in this thread. [Missing image file: Capture.png]
this was on my facebook stream today


0 more posts in this thread. [Missing image file: chert-380.jpg]
Eternal /cht/ thread Discuss any and all things CHERT
0 more posts in this thread. [Missing image file: IMG_1920.jpg]
Anyone here a biology major or at any level of higher education in the field of biology? If so, what sort of information would you pass on to a person looking to get their BS in biology and also, more importantly, to attain quality employment through higher education? Thanks
0 more posts in this thread. [Missing image file: Caratheodory0.png]
guys listen if we define measurability on outer measures like listen guys if we define it like this we can get this guys we get a borel measure! a borel measure from metric outer measures!
6 more posts in this thread. [Missing image file: IMG_20130922_130418.jpg]
Hello. I Just started learning logarithms and I encountered a problem. How do you solve : log (4?6) 1/6 (if its unclear : log base 1/6, logarithmic number 4?6)
1 more posts in this thread. [Missing image file: 1359127260997.jpg]
so, any of you into android programming and packet capture? working on an app similiar to "tpacketcapture". is any one familiar with that? Using VpnService to capture packets is working. now i'm creating my own socket for every connection and am basically the proxy between the phone and the socket, since i'm only getting real packets (ip / tcp header / application data) from the phone but only data from the socket ... neeed help!!
8 more posts in this thread. [Missing image file: s0pcyjy52ejl6g1z2kmi.jpg]
Linear Algebra vs. Multivariable Calculus (calculus 3). These are both second year courses but I love math and want to take a second math course as a first year student in the second term. I can only take one next semester though so which one is more useful/better to know first?
3 more posts in this thread. [Missing image file: beaker.jpg]
How necessary is A Level Chemistry (Britfag here) if you want to study mechanical/aerospace engineering or physics at a top uni? >pic unrelated
17 more posts in this thread. [Missing image file: 1369262784957.jpg]
What is it with autism that give a kid a chance to either be a useless dependent or a fucking genius? http://www.huffingtonpost.com/2013/05/11/jacob-barnett-autistic-14-year-old-nobel-prize_n_3254920.html
13 more posts in this thread. [Missing image file: text.png]
Someday (within 10 years) I will build myself laboratory (haven't seen/experienced how much I will be able to access university laboratories for my own projects,) because I have had big project of genetic/biology research since 18y old. I want to ask /sci/genetists or well biology researchers what kind of equipment I will need to build a average / top laboratory to research genetics, well to be more specific I want to be able to make research papers like this: http://nar.oxfordjournals.org/content/26/17/3908.full.pdf+html Please help me! ps. answers which indicate price, specific equipment etc very much appreciated

Any scientists around?

6 more posts in this thread. [Missing image file: 1360199866506.gif]
http://en.wikipedia.org/wiki/Petroleum_exploration_in_the_Arctic So, oil is created by animal remains that are subjected to sedimentary processes, and then brought to a simmer by metamorphic processes, correct -- or close enough? How exactly does this fit into modern science? How was the arctic so livable millions of years ago? Is evolution wrong? Is global warming wrong? Is Earth crust displacement true? Or is the arctic just a massive sea animal graveyard where everything goes to die? Even so, wouldn't the crustaceans just eat everything eventually? The bones would simply be eroded into sediments before they could be subjected to such heat and pressure as to form oil. Unless the idea is that they melt out of the sediments and pool, but, if that were the case, then why wouldn't the liquified bones, etc, simply continue heating until they were broken down entirely and their molecules scattered? How does oil in the arctic make any sense?
9 more posts in this thread. [Missing image file: datsmileop.jpg]
sin x = 1/sqrt(2) I know its eventually: x = pi/4 But a step-by-step would be nice.
6 more posts in this thread. [Missing image file: article-0-02BD53320000044D-753_468x301.jpg]
So I re-watched the Jurassic Park film trilogy recently and I thought... is it really possibly to clone dinosaurs using frog DNA and blood from a mosquito encased in amber from the Jurassic period? Why can't we do it already? If we can't do it, is there any other way?


18 more posts in this thread. [Missing image file: chromosome.jpg]
If scientists ever found a way of manipulating chromosomes, could this lead to a possible cure for down's syndrome, autism, and aspergers? Hell, could this lead to humans finally having the ability to modify themselves to how they desire by changing their race, gender, and possibly even their sexuality?

Heine Borel and nutty intervals

0 more posts in this thread. [Missing image file: 1-s2.0-S0315086003000028-gr001[1].jpg]
Yo /sci/ so whilst learning about topology I got up to the section on the general definition of compactness. For a bit of context I thought I'd have a look at Hardy's proof of Heine-Borel. One of the examples Hardy gives us is the set of all closed balls centre p/q rational in [0,1], radius ?/q^3. Obviously for some values of ? this is a closed cover of [0,1]. Then he tells us to consider the maximum length of a finite subcover: Turns out this is 2?*(1+1/2^3+2/3^3+3/4^3+...). Obviously the series converges to a finite value, so for sufficiently small ? this is less than one. Thus we can't find a finite subcover so we can pick a ?>0 such that the set of intervals doesn't cover [0,1]. I must say, I guess it's sinking in but feels highly counterintuitive - you'd think you could, given any r in [0,1] find an interval of that form for any ?. So my question is, /sci/, what is the maximum possible value of ? for which we won't have a cover? And which values will be missed?
7 more posts in this thread. [Missing image file: 1371911339629.gif]
Learning about the birthday problem in my stats class. According to all the mathematicians, having 366 people in a room warrants a 100% probability of having 2 people with the same birthday. I say this is wrong - what if you have one person born on February 29th? Checkmate, PhD's

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