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Archived threads in /sci/ - Science & Math - 305. page
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File: sodium-metal.jpg (80 KB, 900x667) Image search: [iqdb] [SauceNao] [Google]
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How do I obtain sodium metal?

I live in a nanny-state where I can't buy this from suppliers or import it from China. I've also looked at how to synthesis it from sodium chloride/carbonate but thats 2scary 4 me

I only want about 30 grams

What unregulated items contain sodium metal?
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>>8061121
>What unregulated items contain sodium metal?

Bottles of sodium metal.

>But they're regulated!

Well how the fuck am I supposed to know what is and is not regulated where you live?
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>>8061199

use some common sense???????
>>
>>8061121
Do a reaction you pussy

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I've heard it is around 200 people competing for one tenured post so your chances of getting it is about as slim as you becoming the next Taylor Swift. Why would anyone want to do research then? Being in a publish-or-perish environment ain't fun. You will be flipping burgers if you have nothing published.
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>>8061019
I want to research Taytay's body, alright.
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>>8061019
>200 : 1
that's substantially better than my becoming the next Swift
>>
>>8061023
Well I mean doing a PhD

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As humans, and perhaps as mammals more generally, we are used to the following theme:
Women looking beautiful, and men doing what they can to impress them to win access to their vagina.
Studies of sexual partners seems to back this up: Women are more choosey, whilst men sleep will sleep with right munters. Chat-up lines are learnt by the men; PUAs exist to teach men how to pick up women, etc.
In the mammal world, the typical rule is that the men are stronger and more physically capable than the women. The competition for which male is most physically superior is one...
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>>8060965
>So.... can you think of any species in which the burden of attracting a mate rests more on the female?

This would potentially happen to a species where the burden of carrying young falls on the male.
>>
>>8060965
There are always exceptions.
Your mom, for instance.
>>
>>8060977
If your theory holds water, sea horses would be a good case study.

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Let's say I need to prove that the expression of a function f(x) can be re-written in some other way than its original expression.

To do that, can I just assume and state that both expressions of the function are equal, and then see how it goes from there? So that if I will arrive at an equality with same expressions on each hand, the proof will be completed. (If the opposite is true, though, it would prove that the function can't be re-written as that expression)

Is there a faster and more acceptable way to do proofs like that?
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>>8060942
Proof that the thing that is changed is the same can sometimes be faster. Can u give an example?
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>>8060949
This is a very basic example that I came up with:

Prove that the square root of x^3 can be rewritten as x^(3/2).

What I do is write sqrt(x^3) = x^(3/2), and then work from there.
>>
>>8060958
Why would you need to proof this? These are two times literally the same function. Wtf anon?

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Thoughts on Cognitive Science as a major?
I mean, I know interdisciplinary studies can kinda suck- but it seems decent as a way to officially study technoshamanism.
>Study of Consciousness
>Neurobiology
>Mathmatical Models
>AI

I mean, I've done a lot of drugs, and well- it seems like the shit I've already been interested in.

It's either that or something like logic.
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>>8060660
I'm interested in cog sci as well. I'd love to create an IQ test for highly gifted people such as myself. Unfortunately the conventional IQ tests stop being accurate at 160 but mine is definitely higher.
>>
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I don't know how it works in the states, but you can do dual majors or even dual degrees over here -- if you're interested in that, spend the arts half your degree doing psych/neuro/philosophy and the science half doing chemistry/neuroanatomy/mathematics

without the science no one will take you seriously, but without the arts you won't get laid, or have a "theoretical framework" to justify all the drugs you're doing
>>
Logic is near

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Am I retarded or is everyone else retarded?

How is this any different than how a voltimeter will slightly change the current of a circuit?
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>>8060621
As in, the tool you're using to observe the phenomenon will slightly alter the phenomenon?
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>>8060621
I suppose it would be different in the sense that the observing mechanism is not changing the frequency or measureable input or output, but the actual perceived state of matter or energy in question.
>>
>>8060621
But measurement doesn't merely slightly disturb a quantum system, it completely changes it.

Hi /sci/

I'm about to wrap up a math undergrad. I focused my curriculum on probability & statistics since I found this to be the most interesting. This means that I've omitted a lot of abstract algebra that I could have taken. Pic related is the textbook used for the algebra sequence at my school. I think the Dummit & Foote book is split into a 3 course sequence on abstract algebra. Is this book any good for self study? Is this too babby tier? I'm fairly strong (for an undergrad) in analysis & functional analysis but I only have experience in...
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I'd say bad overall for self study. It's a classic though, and there are lots of solutions online. Be ready to discuss with other people if you want to work through the book and complete all exercises.
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>>8060542
i thought it was shit, fraleigh is much better
>>
First of all what do you plan on using algebra for?

Second of all, at least for self-study, Aluffi > D&F
https://zr9558.files.wordpress.com/2013/11/algebra-chapter-0-aluffi.pdf

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Ridiculously dangerous chemical compound/pathogen/anything thread.

"It is, of course, extremely toxic, but that's the least of the problem. It is hypergolic with every known fuel, and so rapidly hypergolic that no ignition delay has ever been measured. It is also hypergolic with such things as cloth, wood, and test engineers, not to mention asbestos, sand, and water — with which it reacts explosively. It can be kept in some of the ordinary structural metals — steel, copper, aluminum, etc. — because of the formation of a thin film of insoluble metal fluoride...
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>>8060452
>Quoting without a source

Just leave. This is the last board where you should think that's an acceptable thing to do.
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>>8060467
It was John Drury Clark you autist, are you new here?
>>
H2O for sure
>can cause excessive sweating and vomiting
>is a major component in acid rain
>can cause severe burns in its gaseous state
>accidental inhalation can kill you
>contributes to erosion
>decreases effectiveness of automobile brakes
>has been found in tumors of terminal cancer patients

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say you have two atoms
they're traveling towards eachother at the same speed
hat would happen when they collide?
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depends on what the atoms are
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>>8060392
lead
>>
>>8060392
also depends on how fast

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Why we acknowledge other people farts as smelly and nasty yet most people find their own farts bearable or even smelling good?

If this works because we have an hypothetical "unique scent mark" or something, then why other personal body odours such as armpits, foot or halitosis are immediatly identified as nasty even from the owner of the smell?

Makes no sense at all
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probably something to do with gut bacteria or olfactory conditioning so we know when a gas is from our own ass and thus not horribly dangerous
>>
>>8060377
>yet most people find their own farts bearable or even smelling good?
my farts must really be toxic then
>>
>>8060377
You think your farts smell better than your bad breath or armpits?

What the fuck is wrong with you? People actually enjoy the smell of their own farts?

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Any idea what mineral this might be?

It seems to have formed over a layer of quartz. It is grey and finely crystalline.
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File: solveforx.png (603 KB, 651x569) Image search: [iqdb] [SauceNao] [Google]
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Hey I saw this on shark tank and I'm trying to figure out how you come to the answer. Is it just plugging in random numbers till something works, or is there a faster way?
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>>8060311
divide the two equations
>>
>He does math with numbers
>>
x^5 = a/k
x^2 = b/k^2

x^3 = x^5 / x^2 = (a/k) / (b/k^2) = a*k/b

How do I get into organic materials?

I'm finishing up my 3rd year as a chemistry major currently. Should I look into taking a materials science class next year? Is materials science the area I would be looking into for graduate study?
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start with biomaterials, from biotech. Pretty much everything related to organic materials come from biotech related investigations.

Also food engineering has a lot to do with organic materials and is an interesting, funny and always hired area to work in, specially if you live in a processed food producer country such as murica
>>
>>8060381
thanks for the response

my university only offers biomaterials as a high level ME course, I have none of the prereqs for it as a chem major

Right now my schedule is looking like
Advanced Organic Chemistry Lab
Materials Science
Quantum Mechanics
Pchem 2

what else should I take? i only have taken up to calc 3 do i need more maths if I'm trying to get into this?
>>
>>8060412
Reported.

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I have a theory on what could cause gravity that may go against popular science and I was wondering what people may think about it.

Gravity is caused by the sun. It is a condensed ball of molecules that has a reaction happening that need to be fed. It does not burn like a fire because it is an intense chemical reaction, but like a fire it needs to be fed to continue "burning". It pulls matter, including planets, towards it, and as these planets are pulled towards it it is spiraled around the sun, sort of like a toilet flushing. The sun pulls these planets towards...
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So then why do planets have moons? CHECKMATE ATHEISTS!
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>>8060248
Please be kidding

But in case you're not, /saged
Also, planets don't spiral towards the sun, they fall towards it, the spinning comes from them already having tangent velocity. The sun's reaction is not chemical, its fusion. The whole "sun's gravity create's the earth's gravity" thing doesn't make any sense.
>>
Ever stopped to think about it through?
God, we get these kinds of stoner theories all the time. People need to start considering how real physics work, at least read some introductory textbooks, rather than rely in mere intuition.
I mean, seriously, if you're going to theorize at least try and have it make sense.
>The sun needs matter to feed it so it pulls it from the environment
By virtue of what principle exactly? The issue is how come gravity exists as a large scale phenomenon with such a weak force, as in particles interacting...
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File: fuck you.png (332 KB, 2326x1356) Image search: [iqdb] [SauceNao] [Google]
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So, /sci/, what is the superior engineering degree?
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>>8060087
me fucking your mom's cunt, that degree.
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>>8060087
Knowing that engineers only do it for the money, the one that has the highest average salary.

Therefore petroleum engineering.

Or the one with the most job openings, which is probably civil engineering.

So civil engineering if you are average, petroleum engineering if you are a genius.
>>
>>8060108
Civil engineers are idiots that don't even know how to make a road in a straight line. Chemical engineering master race.

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How do I solve this?
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>>8060064
If you wanted to brute force it you can use double integration, but there are better approaches.
>>
I would try integration in polar coordinates.
>>
The ratio of the area of the top right square within the larger circle to the area outside is probably the same as the ratio of the smaller circle bounded by the larger circle to the area that isn't.
I say probably cause I cant be fucked to check.

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Working mathematicians thread.
How do I evolve from a student into a professional mathematician? I've been researching "heavily" in philosophy of mathematics, yet I cannot find still the secret sauce that makes up a good mathematician.

People who are undergrads or haven't published a maths paper need not reply.

Pic related is an image of how I currently perceive philosophy and practice of mathematics. The math world (Platonic or otherwise) is split into two groups - objects and properties. And then proofs are derived from conjectures, and...
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Better picture
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bump! :-)
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>>8060024
You need to figure out where theorems start to break down, implications of theorems that no one thought of yet, equivalences over different branches of mathematics, etc.

Learn about methods of mathematical proofing, you either want to expand the current tools of mathematics, bridge gaps between current ones, make corrections, or simplify things. This is easier to do at the "limits" of complicated or new theorems. Essentially, if you have an idea, write it down, disregard if it's good or bad at...
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Dumb newbie question, but because I just learnt about electronic circuit analysis, and I haven't found the answer to this on search engines:

So... You can short circuit a battery. Right? Obvious: Connect the positive to the negative, and the electrons will flow to the positive part, evening the voltage and fucking up your day.

But... Connect the positive end of a battery to the negative end of an IDENTICAL other battery, and do they short circuit between the batteries? Nooo... You're just increasing the voltage! Batteries can stay like that for years...
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In scenario 2 you aren't creating a closed circuit. Why would you expect anything to happen?
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>>8060058
because he's an idiot.
>>
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>>8060071
I'm not creating a closed circuit between ALL battery poles, no.

But if you accept the fact that the positive and the negative is seperated inside the battery, I am creating a short circuit between the positive of one, and the negative of the other.

Think of it this way:

I have 1 battery. For the sake of simplified argument, let's say the negative reservoir is in the left half, and the positive is in the right half of the battery, or something like that. So it's easy to physically...
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This is why classical physics is best physics.
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Cosmologists don't have "no clue" , we know dark matter can't be hot via various probes and the Lyman alpha forest points to masses > 2 keV, that puts very tight constraints on warm dark matter.
>>
>>8059913
I keep reading these anti matter/energy posts and wonder what they would have said when Brown suggested that Brownian motion was caused by little particles that you couldn't see, even with a microscope.
>>
>>8059929
>falling for the brownian motion meme
>typical pure science wankery with no real world worth
>he just wants to sit around doing meme math all day instead of science
>great mathematician; awful scientist
>how are we supposed to do experiments with these invisible particles? nice falsifiable "theory"

Something like this, I imagine.

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Fusion when?
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>>8059813
Not until after the Day of The Rope, friend. You know what I mean.
>>
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>>8059813
some think it may be soon anon
https://en.wikipedia.org/wiki/High_beta_fusion_reactor
>>
working prototype not until 2040

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>everything is made of atoms
>atoms are 99.9999999999999% empty space
>everything is made of empty space
24 replies and 2 images submitted. Click here to view.
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Very interesting discovery! But did you find out how magnets work?
>>
*Everything is made from condensed Energy which exists within the space/Time field, my ninja.
>>
>>8059817
alignment of electrons in relitive posistion to one another

is carl sagan a meme?
28 replies and 5 images submitted. Click here to view.
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>>8059781
Depends on your outlook on the world
>>
He was a drug addict.
>>
>>8059803
this he was just a degenerate, spewing new age astronomy BS

no better than Terrence McKenna

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How come all the signals in the air are not interfering with each other? Say you have 3 sine waves as an example (pic related) the resultant would be gibberish. How does a router/reciever understand what is the information that is meant for it?
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Because each receiver is tuned to a particular frequency.

And then e.g. you have things as

http://ham.stackexchange.com/questions/137/what-frequencies-am-i-not-allowed-to-use-north-of-line-a-in-the-usa
>>
(I should add that in frequency space, your pic would be 3 functions that are very seperated from each other)
>>
>>8059672
Could you elaborate on how it is tuned to that particular frequency? In the example (take sine of 1Hz, 2Hz, 4Hz together) if you sample at 1Hz you'll be incapable of seeing wether it went down or up right? (As the others add their energy to the wave?)

>>8059677
Seperated how? As in in/out of sync?

Here's something that's been on my mind lately with all the mars colonization talk...

On mars, water boils away easily, correct? How exactly does that play out with planetary heating and atmospheric thickening? What would be the proper order of events to ensure retention of as much moisture as possible? It'd be incredibly counterintuitive if we boiled away the ice caps in the process of heating the planet, turning it into even more of an uninhabitable desert than it already is.
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>>8059609
It's not really boiling like we think of it. More like evaporation.
>>
>>8059893
Is the moisture held by Mars' atmosphere or does the vapor escape into space? I would think water's escape velocity is high enough that Mars should be able to hold onto it, but I might be missing something.
>>
>>8059609
>On mars, water boils away easily
It boils because of the lack of atmosphere. You can see a similar, but less dramatic, effect on earth at high altitude. I've no idea how to answer the rest of your question.

Hey /sci/, I know jack shit about astronomy.

How come we can observe other galaxies and shit but we apparently can't see this theoretical tenth planet?

Is it because its so dark?
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Yes. its much more distant and its not lit by a lightsource like our sun. we only discovered it because cassini recieved EM signals from the planet X
>>
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>>8059597
Galaxies radiate light. Planets ... well ok planets do to but at a much much lower frequency and power.

https://en.wikipedia.org/wiki/Stefan–Boltzmann_law

That's the energy everything radiates at according to temperature. Apply that to any planet you want in the solar system. Remember the Sun's energy drops off significantly with distance because of the inverse square law. A planet at that distance will receive very little solar energy and emit extremely little.

Compare that to Earth...
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>>8059608
Eh, sorry, here's a simpler energy balance equation that removes the greenhouse effect. In this case we can probably ignore it because Icy bodies like Pluto and further Kuiper Belt Objects will have no significant atmosphere.

It's also already solved for T

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What is the correct answer?
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>>
50%
>>
-2/3 or 2/3 depending on how you solve the quadratic equation
>>
Always change your choice.

Hello /sci/, I hope everyone's doing well. Let's get an interesting thread going, shall we?

There is a set $S$ of points in the plane with the property that any triangle with vertices in $S$ has area at most 1. Prove that there exists a triangle with area 4 containing all the points in $S$.

Let's see how /sci/ solves this.

(Problem is not original)
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are you allowed to make the triangle as big as you want, because then it would be easy
>>
>>8059520
OP here.
Let me ask you something, anon. Why are you still alive? Can you not fucking read?
'has area at most 1.'
'....there exists a triangle with area 4'
>>
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I'm not going to autistically write out a rigorous proof for this.

http://humansarefree.com/2016/02/big-pharma-is-injecting-us-with-cancer.html?utm_campaign=shareaholic&utm_medium=google_plus&utm_source=socialnetwork&m=0
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scary shit
>>
>>8059439
>Big pharma

Stopped reading there.
>>
>>8059439
>conspiracy
>vaccines
yadda yada into trash

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An object travelling at the speed of light would have infinite mass. So, why don't we say that photons have infinite mass? Is it because it functions as a wave instead of a particle? Or is it just because infinite mass would imply infinite volume?
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It's duality phenomena
>>
>>8059395
photons aren't objects like you're thinking of
>>
>Infinite mass

Infinite momentum? How does it even work with the mechanics we know? Or is it guarded by something like: achieving c would also demand infinite amount of energy delivered.

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Could a man be so smart that others percieve him as dumb?
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Probably not. Besides, if people can only see that man as dumb, maybe he is just dumb.
>>
no. please stop posting.
>>
Yes.


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