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Archived threads in /sci/ - Science & Math - 271. page
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File: Perl.jpg (14 KB, 470x313) Image search: [iqdb] [SauceNao] [Google]
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Why is combinatorics so hard?
>>
you don't have a mental representation needed for it

yet
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>>8126578
I find it easier and more intuitive than normie math because it's more directly computational.
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>>8126661
How much combinatorics have you done?

File: Primitive Figure.png (503 KB, 703x495) Image search: [iqdb] [SauceNao] [Google]
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Can something happen after a never-ending amount of things happening one after the other?
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Simple question, what are you guys scared of?
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Looks like I finally found a question that stumped /sci/.
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>>8126567
yes, if the series for the time converges, because then it only takes an finite amount of time

Is there an upper limit to human intelligence?
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>>8126506
of course, anyone who says otherwise is retarded
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>>8126506
the amount of entropy that can be stored in a black hole the size of your head
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>>8126516
If we're able to store information dense enough to be comparable with a black hole, we're certainly able to replace our squishy bodies with purely mechanical ones and expand the brain to cover a larger part of our bodies, or we can just get bigger bodies with bigger heads.

Hey, I recently did some tests for a government agency, among those tests were an intelligence test and in that test I got the question:

>"If you have a constant flow of water from a tap and you were to place an electrically charged bit of steel right next to waterflow, what would happen?"

I had some alternatives which I don't really remember, but some of them were:
>The water will arch out toward the steel
>The water will turn a different colour in the vicinity...
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would*
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>>8126461
I don't know because I only know pure math and not physics/chemistry
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>>8126464
Well, shit.

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>>8126250
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>>8126252
https://en.wikipedia.org/wiki/Lateralus_(song)
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glitches in the matrix
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Just cringe bro
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So lets design a scientific way to try and observe this.

How would you do this? Have a bunch of people memorize a bunch of random things and check on them all periodically and then record the number of reported 'changes' every so often and compare the percentage of reported changes over time to see if there are any explainable spikes in the number of reported changes? Because of course its entierly plausible and inevitable that people will just remember things wrong, but if a bunch of people suddenly inexplicably remember a bunch of different things wrong at the same time, then its evidence of something?
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before

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What's the point/advantage of having multiple majors simultaneously over doing them one at a time?
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>>8125858
it takes less time to do them.
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>>8125859
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>>8125859
Not really though. You'll complete necessary credits at the same rate, the only reason it would ever be quicker is if having the extra requirements drove you to take denser semesters.

What's the best psychological method to deal with fear of abandonment? I mean, I suppose it's something you develop when your mother transmits you lots of insecurity during your first years of life, and that will transform into general anxiety disorder, low self-esteem, depression and other illnesses.
The thing is, once you know what's at the core of the problem, how do you recover? Is there any specific method?
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>>8125840

I'd wager that the only way is to slowly force yourself into the situations where your fear of abandonment appears and then live through them rather than pulling back

only by continuously exposing yourself to these situations and finding that you do not get abandoned you'll change your innate emotional response and way of thinking

at least, that's one of the basic principles of cognitive behavioural therapy, that you have false, exaggerated or unreal cognitions, which we challenge/ease...
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>>8125840
>psyc
>>>/x/
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Therapy

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So does the smbc dude browse /sci/ or is it just coïncidence ?
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idk but apparently the retards who read him do.
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Omega Hall Trolley Problem

Before the Problem begins, Omega uses godlike predictive power to find out whether you are a Switcher or a Stayer.
Omega presents you with three doors.
Two of the doors, if picked, will cause a trolley is to run over five people.
Behind the third door, there is another trolley.
-If Omega predicted you are a Switcher, it will run over ten people.
-If Omega predicted you are a Stayer, it will run over one person.

Having picked a door, Omega now reveals that one of the doors you didn't pick would have been a Five-Person...
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>>8125996

Before the Problem begins, Omega uses godlike predictive power to find out whether you are a Switcher or a Stayer. But you cannot falsify until after the test.

Omega presents you with three doors.
Two of the doors, if picked, will cause a trolley is to run over five people.
Behind the third door, there is another trolley.
-If Omega predicted you are a Switcher, it will run over ten people.
-If...

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Hey /sci/. I was wondering if there was an absolute most efficient way to multiply large numbers together, by hand.

Without resulting to a calculator, how can I take

a * b

and figure out which c fits to

a * b = c.

What would be the absolute best method or approach to calculate what c is equal to, if you had to do it all by hand.
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>>8125757
logs and log tables?
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>>8125757
> was wondering if there was an absolute most efficient way to multiply large numbers together
New algorithms (essentially variants of Furer's algorithm) continue to reduce the asymptotic complexity, but Schönhage–Strassen is the fastest algorithm that's actually used in practice (more advanced algorithms are only faster for numbers with billions of digits).

> by hand.
This is a meaningless qualification. For a non-trivial number...
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>>8125761
OP said "large" numbers, which rules out the use of tables (the size of a table is inherently exponential in the number of digits).

Using tables at the base level only gets you a constant factor, it doesn't change the algorithm or the asymptotic complexity.

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Hello, could any medfag please tell me if getting testosterone shots at age 23 can widen your jaw, lower your gonial angle (don't think so), etc, please thanks.
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No.
Your bones won't "change" in any significant way.
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>>8125650
>type in physical side effects of testosterone shots

I don't understand how people can have so much knowledge at their finger tips, and yet still be so dumb.
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>>8125661
implying he didn't want interaction

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Everything is a lie. Pic related.

Discuss.
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>>8125640
>still using mph
What's it like praying to the sun gods for food?
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wtf? bait or just completely braindead?
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>>8125654
Miles are certainly flawed.

But using a measuring system based on the number of fingers on your hand is equally retarded.
When are you going to grow up and realize that 2's and 3's do a better job of defining reality than 5 ever will?

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Do you die because your bodily functions cease?
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>>8125537

Also, philosophy goes to >>/his/
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>>8125537
A living creature is pronounced dead when it's main organs essential to surviving fail. You can't be dead if all your organs work.
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What are 'you'?

A consciousness? Or a body?

If PopSci is based on real science, then why does /sci/ hate PopSci?
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I don't hate pop-sci just like I don't hate pop music. It's just that the majority of it is bad.
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>>8125448
>why does /sci/ hate PopSci?

>implying
Most of this board is either pop/sci/ or /b/ tier shower thoughts.
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>>8125448
Popsci is good to get people an initial interest in science. It also spreads some science knowledge even if it isn't much. Popsci is bad because it gives people a sense of being more educated than they actually are(degrees do the same thing though). It also gives people a false sense that science works in grandiose movements. I think the pros definitely outweigh the cons though.

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Which is superior? Morning people or night people?

I'm a night person myself, and it seems to me morning people are usually more driven and successful.
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>>8125355
Yes.
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>>8125355
Night person prolly means you are an introvert.

This world is built on who knows who.

It would be unsurprising that morning people seem more successful.
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Do morning people actually exist? Does anyone actually LIKE waking up early? Or are some people just better at forcing themselves out of bed to get shit done?

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It's possible to read enough STEM books to have an understanding of all major STEM degrees?

I'm not talking about becoming a researcher or any college professor.

I'm talking about having enough understanding to be able to mantain a conversation with any college profesor or PHD or look up lectures on youtube and understand them.
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Those PHD students have spent years studying their field to get to where they are, and professors have spent even more. Exactly how long do you think it's going to take you to reach this level in EVERY field?
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>>8125274
You could hold a conversation with them, but you sure as hell wouldn't be able to contribute much to the discussion.
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>>8125274
No; you would be lucky to get through EE and ME/AE alone at a PhD level after 40 years of age

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What if matter can not enter black holes but only orbit it due to gravitational spin.
Think of it like the international space station falling but never falls due to the earths spin thus orbit.

Black holes are gravity held together by gravity it does not use matter or destroy matter
It only makes and smashes elements by crushing presser within its accretion disk and after it dies its accretion disk forms new stars and planets due to the clumping effect of the spin but super massive black
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>>8125246
:holes gravitational forces are too weak to keep stars and planets from forming within its disk
thus black holes are just gravitational holes in space time that only recycle matter
It does not destroy or touch matter its self.
hawking is a quack.
and black holes are fucking matter redistributors.
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This seems autistic. Things do not orbit earth because of its spin. They orbit because of their horizontal velocity. The super massive black hole at the center of our galaxy for example does have complete solar systems orbiting it but nothing orbits at a super close distance like near the event horizon.
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>>8125275
you can not create a orbit around nothing in space
gravitational spin=/= spin

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How long can you safely stare at the sun?
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you mean before sun gets bored of you and turns away? 8min 19s.

define safely. no changes for eyes and clear sky? only for some seconds i guess.
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>>8124896
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>>8124935
Wrong
Retina is not exposed to the outside world ( except for minor amount of light) therefore it's much more delicate than skin

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What are some of the rarest medical conditions?

Obviously, to keep the topic "sexy", conditions that really fuck people up are of interest. But above all we are interested in extremely rare-yet-identifiable conditions, which might not even negatively impact a patient's life to a significant degree.

The type of thing for which there are fewer than 1,000 patients in the world at any given time.

In these hyper-rare cases, how can science and/or medicine be legitimately performed? You're dealing with a small sample size, which makes things harder.
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>>8124860
I don't remember the name of it, but there was some condition that caused your whole body to become bone over time.
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>>8124868
bonitis?
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>>8124868
Fibrodysplasia Ossificans Progressiva

In terms of rare conditions this has to be up there. Progeria, Epidermodysplasia Verruciformis, Cotards Delusion, Alstrom syndrome and Harlequin ichthyosis are to name just a few.

Joseph Merrick (OP pic) is a bit of a weird case since there is no consensus on what he suffered from, most likely Proteus syndrome and perhaps a form of neurofibromatosis: two very rare diseases in themselves, making him possibly the least lucky person in medical history.

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How can I describe the points of $\operatorname{Spec} \mathbb{Z}\left[ {{x_1},{x_2},{x_3}} \right]$ ?
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pleb here, what field of math is this?
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>>8124842
Algebraic Geometry
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>>8124842
algebraic geometry

its the field where people who dont understand geometry hide

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Why does knowledge of the particle's path collapses the wave function?
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Measuring it with a device changes their property. It doesn't know anything. The "observer" isn't a human, it's a device that interupts the process.
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>>8124826
The measuring devices in a quantum eraser are identical.
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I collapse your ass if you do not stop creating these threads.

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How does this make any sense to anyone?
I'm trying to find an explanation of this, but every single one, the author of the explanation clearly has no idea what he is doing.
Not only that, but there's three different variants with no explicable difference in usage, yet every single one is different from each other.
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$\vec{F} = q\vec{E} + q\vec{v} \times \vec{B}$

is the law for a single point particle with charge q. If the electric field is taken to be zero (E = 0) then it becomes

$\vec{F} = q\vec{v} \times \vec{B}$

Now consider a small infinitesimal part of a wire with many electrons flowing through it with no external electric field. The new form of the law becomes

$d\vec{F} = Id\vec{l} \times \vec{B}$

You can now integrate it to get

$\vec{F} = I\vec{l} \times \vec{B}$

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>>8124736
>How does this make any sense to anyone?
It barely does. It is an attempt to simplify the complex relationship between moving charge (current), magnetic field and force. All three are vectors in 3D space with an orthogonal relationship. Hence the left-hand / right-hand motor /generator rules.
It's all about a magnet and conductor, move them and a current is produced, run a current thru the conductor and motion is produced.
then you get people like

Comment too long.
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>>8124736
> How does this make any sense
What is "this"?

The equation for (the magnetic component of) the Lorentz force (F=q(B×v)=B×I), or the mnemonic using fingers?

The Lorentz force doesn't "make sense". It's just how the universe happens to be. Physics isn't math; you can't derive it from first principles, you just have to make empirical observations and describe the results.

One of those results is that the force on a charged...

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ITT we shall discuss whether famous /sci/-related books of famous authors are meme-tier or actually readable. Start with pic related but feel free to add more books.
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>>8124732
>pop sci books
This is shit, OP. Shit, every book in your picture is a steaming pile of shit.

Serge Lang's Algebra is meme tier, Rudin is meme tier, your books are shit
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>>8124738
yet you read all of them?
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>>8124831
I dont need to put a turd in my mouth to know that it doesnt taste delicious

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If f(x) is a polynomial, then its derivative f'(x) is the coefficient of t in the expansion of f(x+t):
$f(x+t)=f(x) + t \cdot f'(x) + \dots$

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>>8124627
yes, the derivative is the linear part of the function
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>>8124627
>what are taylor series expansions
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>>8124627
how's freshman calc going, op

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What species is this /sci/?
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>>8124621
that is Takeaus betteruspicturus of the genus use a better camera
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Kabuto, and they evolve to kabutops
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>>8124621
That's a human hand. I'm 100% sure of that.

I am sure it is a homo sexual.

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/sci/, I want to learn about concrete and cement, especially geopolymers. Not engineering stuff -- i.e., how to use it -- but more underlying basic physics and chemistry of it. Can anyone recommend a book or a review article?
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>>8124526
it silicone
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>>8124537
Silicone is what you use to make boobs bigger you dummy.
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>>8124543
Don't you make boobs bigger with concrete?

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I want to program science stuff but I also like messing around with making cool OpenGL shit. I know python but it gets really slow as soon as you run anything a bit complex. What's the best language for my needs? C, Lisp, Matlab?
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>>8124442
Julia
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>>8124442
In the real world anything under 1000 lines of code Matlab, more than that C or FORTRAN.
C has everything object oriented, procedural, machine level.

http://www.sci.brooklyn.cuny.edu/~mate/nml/numanal.pdf
https://www.cs.rit.edu/~ats/books/ooc.pdf

Cool book on Windows games in C - get a new one with the disk.
http://www.amazon.com/Windows-Programming-Dummies-eacute-LaMothe/dp/0764516787

Basic DS
http://www.amazon.com/Programming-Abstractions-Computer-Science-Paperback/dp/B004D81WSE

Also...
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>>8124442

>I know python but it gets really slow as soon as you run anything a bit complex

that's because you suck at programming. you can try C and openGL but then you will just have even more complexity that you can fuck up. learn to program properly and then try again.

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If the Many Worlds Interpretation is true, does that mean that there is a Benny Hill universe out there?

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> If the Many Worlds Interpretation is true
It's not.

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>>8124361
[Citation Needed]
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>>8124359

The cops are exactly the same though.

File: Terraforming-Moon-and-Mars.png (693 KB, 1280x1088) Image search: [iqdb] [SauceNao] [Google]
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Is terraforming a possibility? And if so, would it even be worth it given the time it would take?
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>>8124264
>And if so, would it even be worth it given the time it would take?
The biggest problem with humanity is it's utter contempt for overhead costs.
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>>8124264
would terraforming the moon be possible if we surrounded it with massive superconducting rings to make a magnetic field strong enough that we could sustain an atmosphere? I saw a paper about doing it for earth and they said something like the power from 12 nuclear power stations could easily produce a magnetic field something like 10% the strength of the earth's (i cant find the paper now but anyone else who has read it please correct me if im wrong) and it got me thinking about the moon.
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>>8124403
No. Gravity is way too low. Same with Mars though gravity isn't that far off to keep the atmosphere in place for an extended period.

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If you like math so much, why don't own a gold medal from IMO, anon ?

How many problems can you resolve ?
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>>8124198
>If you like math so much, why don't own a gold medal from IMO, anon ?
cuz i can barely qualify for the USAMO and even then i score like a 10
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>>8124198
Mathematical contests are more about how well you can apply trivial knowledge in convoluted ways - it has nothing to do with how good of a mathematician you are.
That said, you should definitely feel good if you do well in them, but if you don't do well, you shouldn't feel bad either because it says nothing about how good you are at maths.
I enjoyed the preliminaries to the IMO when I was a kid but I didn't have much time to prepare for it since I wasn't told that I was being entered.
I...