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Archived threads in /sci/ - Science & Math - 247. page
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What is the evolutionary advantage of smoking cigarettes? Why haven't people who are genetically predisposed to enjoying tobacco and addiction bred out of the genepool if it is so unhealthy, and unhealthiness = less fitness for mating?
>>
>>8170406
Seems like there are considerably worse genetic traits that are being kept alive.

Maybe it just takes all kinds.
>>
It doesn't have a big enough impact on health to make people croak before having sex.
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>>8170406
>unhealthiness = less fitness for mating

Not on 2016. If anything the druggies will be the most irresponsible and the most likely to breed.

That said, addiction is not a genetic thing, we all feel pleasure and if we were to decide that pleasure is more important than everything else then you are literally addicted by choice.

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Are space elevators viable and worth it?
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>>8170262
Yes, and yes.

Problem right now is fabrication.

carbon nanotubes greatly lose strength for every atom out of place.

so 10 atoms out of place on a cable that should have gigatons of tensile strength. results in a cable that a few hundred pounds of tensile strength.
>>
>>8170275
How would one produce enough nanotubes for such a project? What would the cost be?
>>
>>8170275
Do you know what a realistic construction for a macroscopic carbon-nanotube-based "rope" would be? Seems to me you need to make strands that are each a continuous nanotube miles long, which is quite a feat. Can they be shorter and braided more like a rope? I just imagine that fraying apart under the massive tension.

Not protesting, I find the idea cool, just don't know much about it.

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Whats so spooky about the Pi number ?
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>>8170252
It's real
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>>8170255
desu, if we can imagine that we can imagine it then that is close enough to be rigorous mathematics.

Nigga over there is fine both with creating 'imaginary' placeholders for irrational numbers, like the square root of two, and he is also fine with approximating these numbers when doing applications like plotting graphs.

If we can algebraically construct numbers whose square equals two and if we can get numbers that approximate that result then why is it nonsense for him to assign those approximated...
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>>8170255
>>8170300
how the fuck can pi be a infinite number?

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From a mathematical perspective , is it worth it playing lottery games? can you beat the odds?
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math nerds think ya and this is why theyre homeless XD
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Yes. Most of the time, you can beat them by hosting them, which is why casinos make money.
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>>8170220
It's possible to make money, if you're smart enough. However, for most, it's a pretty bad idea.

http://newsfeed.time.com/2012/08/07/how-mit-students-scammed-the-massachusetts-lottery-for-8-million/

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so how dull is it that dark matter is litterally just black holes, formed from primordial gas with less mass than a stellar BH, but more than a neutron star, forming halos around galaxes that keeps them together.

it's nothing amazing
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Does this mean it's impossible to leave a galaxy without getting sucket into a black hole?
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>>8170207
Give me a source m8
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>>8170263
Even if OP was right about DM being entirely black holes, it can't be impossible to leave the galaxy because light from other galaxies can travel through the halo to our planet without getting sucked into any black holes.

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>Go to college to get a good job, they said

reality:

>study every fucking day
>stress every day
>trying to focus on my studies, if I slip and go on the internet I'm completely fucked
>stress of whether or not financial aid will help cost of living
>stress of achieving a high GPA

THIS FUCKING SUCKS ASS BRO. This literally isn't fun, I'd almost rather...
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>>8170095

>work at a manufacturing company

reality:

>work every fucking day
>stress every day
>trying to focus on making ends meet but taxes, groceries, gas, electric...
>Stress of whether I will continue to have a job and be able to feed myself
>Stress of not showing up late, being a dumb shit or being unlucky and getting fired

you're...
>>
Make a schedule and ask for help/form a study group.
>>
you need more drugs in this equation

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Is wild fire as seen in Game of Thrones Season 6 finale episode scientifically explainable ?
whats its real life counterpart if there is one
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look up on greek fire fagot. a simple google search would have given you the answer
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>>8170015
Greek fire.
Napalm.
Any sufficiently compressed and aerated flammable liquid.
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>>8170022
>real world not guesses and flame throwers

Well in liquid form the fumes are not flammable until the liquid catches fire. Has to be something with a lot of energy though and with explosive properties. I would say a type of rocket fuel is the only thing that really matches these properties.

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how would one go about "opening" the 4th dimension? aka making it accessible in some way?
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>>8169885
Math.
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>>8169885
Have you ever considered the possibility that you don't actually understand the scientific terms you're using? That maybe all of the advanced scientific explanations you've ever heard have just been metaphors, oversimplified to the point of removing all useful information? And that, therefore, you not only lack the knowledge to answer the questions you have, but also to know what questions are even vaguely coherent?

I would strongly recommend looking into this possibility.
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you'd die instantly, your guts would be ejected into the 4th dimension

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which calculation is this number the result of?
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>>8169862
It could be anything
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>>8169862
that number + 0 = that number
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>>8169862

Judging from all the 0's at the end, I'd say it's something like "what is the smallest number divisible by every element in the set "blah" where blah is a certain subset of natural numbers. Actually, I think all the 0's at the end might be able to tell us that, but fuck counting.

Law Of Attraction thread. Does it work for you and at what percentile.
>>
As a psychological idea it has a certain rationality to it. There is clearly a very strong (if very complex) relationship between our behavior and our thinking.

Anything beyond that is absolute garbage. The idea that thoughts somehow cause situations far removed from one's realm of activity to occur (like somehow causing the Lotto balls to come up on what you want them to be) is painfully stupid and I'm honestly shocked how popular it is and how readily accepted it is (even if only in minor variants).

Anything which tries to justify such a scenario using...
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>>8169859
I thought about making this thread yesterday in the morning. So yeah I get some synchronicities.

I had some weird experiences with it, I can share some if thread lives.

But desu, I never got the complete manifestation, just signs, sinchronicities, weird weird coincidences.

Like this one (less weird than some i had). Im used to that. I also observe everyone I know and analize their states of mind and the way they shape their lives. It works, there is correlation.

I just havent made it to...
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>>8169874

>>8171252
>I had some weird experiences with it
Something most people fail to recognize is that it would be weirder if nothing weird ever happened, that's probability. Failure to recognize this is how some people end up with conviction in religion, "miracles". There's also the simple fact that our consciousness lies to us about the outside world constantly - blind spots are the most obvious example.

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What was his problem, /sci/ ?
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>>8169780
It is society's problem, not his.
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>>8169780
Autism.
He's right. His methodology of getting his point across was shit.
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>>8169780
Isn't that Terence McKenna?

I'm tired of our normie planet

How would someone feasibly create an artificial orbital ring that doesn't periodically demolish cities with craters?
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>>8169744
we already HAVE artificial orbital rings.
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blow up an asteroid in orbit and hope it doesn't recoalesse.
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>>8169744
Use lots of tiny particles such as quartz sand. Or dry ice that will sublimate before reaching the ground.

Demolishing cities isn't the biggest problem, destroying satellites in orbit will be a huge problem.

One Rube Goldberg grade solution is to put huge numbers of absolutely gigantic space mirrors in high orbit, above geostationary orbit. It will be a nice view but you will have to say goodbye to night time darkness.

Did you see this video? https://youtu.be/UT2sQ7KIQ-E

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What does /sci/ think of nootropics?

Do they work?

Results?

Studies pertaining to nootropics?

Is it just snake oil?
>>
I haven't had any work, but I've been on more prescription psychotropics than most people can name. Almost all to no result, or side effects. The stims, benzo, mood stabilizers didn't work, but an MAOI might have.

You'll have to be careful about what you get. Ironically since the science has been advancing, the more and more specific the mechanisms of action become, the more we get side effects. something like IDRA21 might cause brain damage if taken for extended periods. Unifiram, and especially sunifiram, might have side effects from increasing turnover...
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>>8169698
I started taking modafinil three weeks ago and I've noticed varying effects on my mood and cognition.

The good
Rediculous memory and retention when studying
Increased cognition speed
Better social life (humour is strangely easier to conjure)
I have CFS, On it It's like i don't have CFS

Feels a bit 'racy' like a massive caffeine hit and can get irritable after a while
Always have to be doing something, Watching TV is awful on modafinil
I don't eat as much as I used to
Binding agent causes my digestive system to react nastily

The ugly
It's narcolepsy medication for a reason.

Probably the best out there if you're looking for a serious boost in brain power. Closest you'll get to NZT-48 anyways.
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>>8169698
Your mind is weak if you need them.

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>finished engineering degree
>Don't know what greens theorem is or what it signifies physically
>similarly with del, nabla, eigenanything, matrix ranks, singular matrices
>and this is just the stuff I rememer off the top of my head
>Never done anything relating to converging / diverging infinite series
>line integrals????

Can I even be considered human? My university is...
>>
Except you're not a math autist so you're fine. Your job is to design important stuff, not calculate things.

Though I suspect you're a role-playing troll.
>>
I'm in third-year EE. The worst math we had this semester was square roots lol.
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>>8169674
what country is that uni in OP?

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Calculus II (as per the typical American course) is a complete waste of time. I'm not a disgruntled student in calculus II. I just graduated with a math degree and did the baby analysis and so on.

Why on Earth do we waste so many people's time teaching them how to calculate obscure integrals? All they really need is to be able to integrate polynomials, integration by parts, sin/cos, maybe a few other tricks here and there.

They will likely never encounter integrals like these; if they do they can easily reference a text .

This is precious effort...
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>>8169673
How little math did you do in your degree that some difficult integrals NEVER showed up?
>>
>>8169704
I think OP just doesn't realize he's Autistic.

>math notation makes sense to me so its good for everyone
>>
>>8169704

I didn't have to look up an integral a single time. I also didn't need a calculator after freshman year.

Which is not to brag: I've forgotten all those clunky integration methods and I'm no number cruncher. As far as I can tell this is typical for a math major.

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>Green's theorem only applies to "simply-connected" regions
So when I take the line integral of a the unit circle according to vector F, I get 2pi. Is this because the curl leaks out of the origin where F is not defined?
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>>8169650
You'll learn about that when you get to know the generalized Stokes theorem and complex analysis. It's got something to do with poles and residues. You can imagine it like some "source" or "charge" being located at that singularity, so that some "force field" goes through the region.
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>>8169650

The vector field in the pic is Hodge dual to (a representative of) the generator of the first de Rham cohomology group of the punctured plane. Since this group is non-zero, Poincare duality for compactly supported cohomology easily implies that the cap product with the generator of the first homology of the same region is non-zero.
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>>8169731
Why do people do this ?

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Would it theoretically be possible to kick a bullet out of the air given that you hit it perfectly from the side and time it exactly right?
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>is it possible to deflect a 762 m/s lump of metal with your small frail foot clothed in wool and rubber
>>
The only way to do it that slowed its momentum would result in great injury to your foot. If you "timed it perfectly" you'd just redirect it.

So, not really.
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>out of the air
what does this even mean? a kick to the side isn't going to impart any forward or backward change in momentum so at best you'll just deflect the path

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it is probable, if not likely, that an advanced civilization lives under the surface of Mars, deriving energy from its heat, and its likely they live in a type of virtual reality environment, so they don't care about us or the external world because they've been under for so long. But if we woke them up, they might seriously fuck our shit up.
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>>8169606
What?
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>>8169622
Exactly.
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thats a solidified volcanic splash btw and not a headcrab

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I can logically see why a mathematical proof works by following the steps of its derivation. Although, I don't feel like I understand on a more fundamental level what is happening, why it works and how someone figured it out.

How do people gain that fundamental understanding of math (what would be called "intuition" in other areas) contrasting the pure mechanical aspect?
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>>8169386
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>>8169386
Unfortunately what you desire can only be gained by being born with it.

In other words you will always be a brainlet.
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>>8169386

intuition isn't intuitive. it's more based on experience.

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>doing exercises from a textbook
>trying to do one of them
>get stuck
>decide to not give in
>keep working at it for about two hours
>the answer was probably simple to input (since it's a well defined textbook problem)
>my IQ is in doubt
>Oh my God, how can I think of myself as having a high IQ if I can't get this!?

>>
Being egotistical dosnt mean you have high IQ, it just means you like to stroke your own dick to shit others might find slightly or marginally challenging

Youre literally the embodiment of an "intellectual chad" (ei "Im smurt ur dum, me do problems hur dur) and if you have to question how you think then ye you're not as smart as you want to be.

Improve, if you only focus on how good you are gl on improving yourself you literal evolutionary self cuck
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>>8169122
> usually pick up what's actually going on in the book
> often spaced out
> can't pick up themes or subtext
>>
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>Solving a problem by trial and error
>Not understanding underlying concept

Ever think of picking up a trade?

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What type of insect is this?
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>>8169069
>>
It is a "Caterpillar"
>>
That's an owl

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If $\sum\limits_{n=1}^{|\mathbb{N}|} 2^{-n} = 1$, then what does $\sum\limits_{n=1}^{|2^\mathbb{N}|} 2^{-n}$ equal?
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>>8168992
1
>>
Can you define what it means to sum a series over uncountably many terms?
>>
But it doesn't equal 1. It's asymptotic.

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Hey /sci/

I work a physically demanding job. I walk about 15km a day minimum and climb about 300 feet of vertical ladder a day. Also lots of crawling and random climbing. I also wear fill nome coveralls, leather gloves and a hard hat in +30C.

I'm also in the gym for 1.5 hours a day.

I'm drinking about 8L of water a day. Some bozos are telling me this is going to kill me or cause negative effects. These same assholes drink about 5 cups of coffee about shift and no water, I don't know how they're not dead.

Is there too much water...
>>
Wear full nome coveralls *

Sorry.
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>>8168906
Yes, you can drink more water than the body can handle.
>>
>>8168906

How long have you been doing this?

How old are you?

Where do you live?

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>>
obviously universe would win

because...where the fuck would it go
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>>8168660
I think OP is just putting "will we eventually be able to escape the end of our universe using technology" in a meme way.

>>8168649
I'd say it's plausible that we could survive. We could do a lot in 30 billion years, considering the rate of our technological progress.
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>>8168649
Quality /sci/ content as always

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Is psychology a meme field?
>>
Yes.

Just like STEM, and any Physics that isn't Thermonuclear or Astro.
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>>8168617
Psychology isn't really a meme, but it is largely bullshit. It's definitely not a science because psychology has some very serious problems with reproducibility, which is a core principle of the scientific method.

Maybe it is a meme too. I know quantum mechanics and game theory are both straight up memes.
>>
>>8168637
M8, the scientific method itself is fucked up. There is no clear formulation of what it is. The one taught at schools, the inductive one, is flawed.

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Why do we desire affection? How do I eliminate the desire and the care for other people
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>>8168582
>>
>>8168582
what phedopile cartoon is that?
>>
>>8168582

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>>
A funny man.

All conjecture, important because he brought kids and childhood into the picture.
>>
>>8168571
>psychology
>>>/x/
>>
>>8168571
he's a good litmus test on who knows what modern psychology is and who has no clue

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there can never, nor will there ever be, time travel... sorry future Marty McFly's! The only time travel that can exist is in the movies and in your imagination and memberies.
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>>8168550
Take it to facebook you pop-sci moron
>>
Preaching to the choir...
>>
>>8168550
learn to use the catalog, bruh
>>8167496

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Have you ever worked out the solutions of a 4th degree polynomial using the quartic formula? By hand, not coding it into a computer.

If not, why don't you do it right now?
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>>8168547
>why don't you do it right now?
Because it would offer zero enlightenment to do so.
>>
>>8168554
It's good algebra practice and you can say you did it.
>>
looks too hard

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I'll try to make this quick.

I'm 21 years old. I joined the military after high school and got out recently. I'm going to be starting school in the fall and I need to take Calculus to transfer to the program I want. The highest math I took in high school was Precalculus, which I barely learned because I was a depressive shitter. That was almost three years ago and I haven't really been in a classroom setting since.

I do not consider myself a prodigy or any other sort of genius.

How can I make sure that I don't fail this class? How...
>>
>>8168467
>this math review
totally doable

I hear the format of Kahn has changed recently in ways that people don't appreciate.

www.patrickjmt.com has a lot of videos on the same pre-calc/calc topics

or you could go to bookzz.org and download a couple textbooks after simple keyword search
>>
>>8168467
Your military discipline will get you through ez.

All Calc classes hold your hand with review stuff that you'll need.

Trying to learn yourself will most likely discourage you.

If you want to review, look up formulas about lines, circles, parabolas, etc. And understand why they look the way they do. You can also ll read up about exponents, natural logs, and trig if you want to. Trig won't be important until Calc 2 and 3 though.
>>
I assuming you are a CC student now, how exactly are you able to go directly into Calc 1? I thought all CC's make you take a math placement test. If so, you wont need worry about review because youll be placed in the appropriate math. Anything lower than trig/precal is a huge waste of time, since precal is essentially a very large fast paced review of algebra.

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