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Archived threads in /sci/ - Science & Math - 267. page

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I read some interesting statistics on the sexual behaviour of Yanomamo girls a few days ago.

In Yanomamo societies a girl is forbidden to have sex before menarche which usually happens at about 13-14 years of age. But Chagnon found that 2/3 of girls become sexually active before then at about 12 years of age.

It looks like these rules against sex before menarche are just as much social inventions as the age of consent in our societies, and just like in our societies they are often broken. It seems that girls have evolved to become sexually active slightly before menarche and the beginning of their fertility, which occurs about 2-3 years afterwards.

Why is this? What's the point in being sexually active (and attractive) before becoming fertile? Is it something to do with the fact we form long-term relationships and that girls are often chosen as wives several years before they reach reproductive age? Maybe being sexually active and attractive gets male attention and incites them to compete for the females?
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Stop it with these pedo threads
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>>9062097
it is not about what your body can do
it is about having a developed mind and not being taken advantage of by old grumps
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>>9062097
Tell it to the judge OP

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If the universe is just a giant heat engine how does making money relate to this?

Does making money accelerate entropy?
4 posts and 1 images submitted.
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>>9062087
>the universe is just a giant heat engine
It isn't.
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>>9062087
A hs biology teacher once told me that ATP is like money.

>http://www.creationresearch.org/crsq/articles/36/36_1/atp.html

>These low energy bonds must be translated to high energy bonds, and this is a role of ATP. A steady supply of ATP is so critical that a poison which attacks any of the proteins used in ATP production kills the organism in minutes.

No money, civilization, as we know it, collapses. Civilization is like organism here.

> Note that ATP is an energy-coupling agent and not a fuel. It is not a storehouse of energy set aside for some future need. Rather it is produced by one set of reactions and is almost immediately consumed by another.

Analogous to money transactions etc etc.

Hyperinflation can lead to rather chaotic circumstances, and like government's economies, when there's too much ATP (money), the body stops producing ATP.

It allows civilizations to exist via a comon survival tool. Without money regulating food, many people'd starve because no one'd feel obligated to maintain the crops and farmland.

Then again, communes're civil and live primarily off of farmed crops, so hey.

Buddhist monks don't accept or use money of any kind and they're all about self-control, so there could be some anti-entropy effects from that. Hope I answered some questions for ya, bud. Peace.
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>>9062087
>Does making money accelerate entropy?
Money is supposed to be the incentive you receive by reducing the entropy of something in accordance to the market's needs (like shaping metals for cars, which are complex systems and lower in entropy, or fabric into clothes, or ordering disordered financial data in a table as an accountant, hiring a construction team to build you a house, a maid to clean and order that house and so on). Money's primary function is therefor reduction of entropy within the system it exists in, hence why our society gets progressively more ordered and complex with every next day - you get money for reducing entropy and then proceed to spend it to someone else after he has reduced entropy for you. Or at least that's how it applies for our closed system, because we create waste around us by reducing our entropy.

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>>9062086
No
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>>9062086
Mathematics is already reduced to logic, but unless you are have a supercomputer for a brain, there is no escaping intuition.
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that's what it already is. just look at pure math

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Has veganism been disproven?
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2716748/
4 posts and 1 images submitted.
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OP is a retard
sage
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>>9062201
Yeah, veganism was disproven long before this crap.
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>>9062272
(not true by the way)

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Does temporary sleep deprivation permanently affect IQ?

Like, how many lost nights of sleep would it take before it has a permanent effect?

Is there a scientific answer for this yet?
8 posts and 1 images submitted.
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You lost 1 IQ point for every 2 hours of sleep deprivation
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>>9062036
>tfw negative iq
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>>9062036
Permanently? If so I almost find that hard to believe.

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https://www.chess.com/live/game/2222836902
This is a 5 minute game.
Can anyone tell me, what disfunction of my brain is responsible for something like this (last move).
This happens relatively often and i just want to know if there is a name for that.
The thing is, im curious, if im just a complete retard or if its just one thing im not good at.

My assumption is , that i was thinking a move ahead, but obviously there is still something wrong.
I guess I will do an iq test in the future, because it is really important to determine what im capable of for my future career choices.
5 posts and 1 images submitted.
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>>9061944
You need to git gud.
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I don't understand your question.
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>>9061944
Pressure + Timed = Sometimes doing stupid shit.

IQ tests test pattern recognition, while chess is more about memorization and processing many different possible moves in little time.

Chill, it's not like you're going to be a grandmaster, you'd have to be a terrible autist for that. Focus on your career to achieve tangible success.

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A typical US Army rifle squad of 10 guys carries like 100 lbs of batteries for radios and 150 lbs of water. Could hydrogen fuel cells improve this?
4 posts and 1 images submitted.
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>>9061938
Could you explain further?
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>>9062032
Hydrogen fuel cells take hydrogen and oxygen and poop out electricity and water. But they're still expensive to produce, sensitive to heat and contamination, and not too durable. Also, you have to carry the H2 supply around with you.
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>>9062069
I think you answered the question. If its not durable and expensive, why change what we do now? There's a lot of infantrymen, so buying enough hydrogen cells for all of them, plus buying hydrogen tanks would be expensive and would take a while to actually distribute.

I dont think that an infantryman is going to get any lighter. In my opinion, we should focus on training them in the weightroom and get them to the point where rucking with all their weight becomes second nature. That wont happen unless we legalize steroids or start picking bous out of highschool and start their training there, but those are completely different topic.

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How much Pure Math do Applied Math PhD's know and how much Applied Math do Pure Math PhD's know?
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>>9061931
have a (you) for that pic faggot
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>>9061931
A lot
not much
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It depends on the subfield of pure math or applied math.

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Dear Sci,
do I understand it correctly that moving a magnet close to any medium that can conduct electricity(e.g. copper wire) will cause a weak current?
If so, could it also cause weak currents in the human spine - as nerves are also conducting electricity?

Thanks
pic unrelated
4 posts and 1 images submitted.
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https://www.youtube.com/watch?v=u36QpPvEh2c
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That medium must act like an inductor (typically a spiral-shaped wire).
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>>9061919
wtf, water reacts to magnets? now thats news to me.
Thanks Sci!

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What's the specific kind of insurance contract called where you pay in small, regular increments for insurance, however, once you've payed the total (or equivalent) amount of the object of insurance, you no longer have to pay [or some similar alternative to this]?
5 posts and 1 images submitted.
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>>9061898
Let me consult Science! (tm), and see if it can provide the answer...

Nope.
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>>9061906
What forum would you suggest? kmt
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>>9061953
No ide. But it is not really on topic here.

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>tfw you wake up one day and realize you can't remember your basic multiplication tables anymore

what the fuck is happening to me /sci/? I had difficulty trying to multiply out 12x13 in my head the other day. When I attempted to do it by hand, I completely forgot how to multiply it out that I had to look at a YouTube video for help.
I'm not getting Alzheimer's already am I???

I'm only 21 years old and currently doing a masters in Quantitative Finance. I had a GPA of 3.6 when I was a math undergradte and before that I was in the top 10 in my class in high school entrance exams.
9 posts and 1 images submitted.
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>>9061862
12x13 = (10+2)x(10+3) = 100 + 10x(2+3) + 2x3 = 156
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>>9061870
>not doing 12*13=12*12+12=144+12=156
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>>9061862
12x13 is not a basic kek.
But still is easy to do in your head if you remember that shit they thought us in elementary school

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are we the smartest or the dumbest living being in the entire universe?
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Thus far, yes.
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>>9061858
multi-verse or universe?
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>>9062064
>multi-verse or universe?
thanks lochie

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What is it?
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3.6
>>
2 * 9 / 3 * 2 - 1

Or to simplify as a quantity, 11.
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2 * 9 * (1/3) * 2 - 1 =
12 - 1 =
11

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Just replaced a ceiling light cover and the metal base of the new cover is in direct contact with the metal bayonet fitting that holds the globe. But when the light is switched on, touching the metal cover doesn't give you an electric shock. I just don't get it.
Is it possible that I can't feel the current? I stuck some aluminium foil onto the end of a cardboard roll and brushed the metal cover first to see if there were any sparks and there weren't. I've got no idea if the light is grounded or not but it's an old Australian house circa 1972.
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>doesnt electrocute him
>wonders if its a death trap
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>>9061840
>hey this xray doesnt burn me lol can i keep sticking my dick in the tube lololololo
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>>9062311
>thinks a light outlet gives off x-rays
>potato.jpg

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>dude mushrooms are more like people than plants lmao
What is this bullshit?
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Ever heard of photosynthesis?
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>>9061797
When was the last time you saw an animal grow up out of the ground?
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>>9061811

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