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Archived threads in /sci/ - Science & Math - 1655. page

This is a blue board which means that it's for everybody (Safe For Work content only). If you see any adult content, please report it.

So when I was a little kid you could buy these crystal pack things where you put like water in a little dish then you had like a cardboard tree thing and it would somehow grow baby crystals right? Eventually I remember the tree got broken and I lost my baby crystals so they couldn't grow to be big proper crystals.

how then do they turn these baby crystals into crystals they want like emerald? Do they just add like food colouring and a the crystals turn green and that is a emerald? How long does it take to turn baby crystals into big proper crystals you can sell in a store? Can you do it at home?

Does the same apply to metals as well? is there a way you can grow baby metal and then choose what sort of metal you want it to become? what does a baby metal even look like? Similar to crystals I assume? I remember seeing metal crystal things when I was a kid as well.
21 posts and 3 images submitted.
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>>8096013
>you can make crystals this easily

sorry OP I can't answer you, but I'm coming back after I try this xD
will post pics
>>
You're not allowed to post these cool crystals informationals ever since that kid hospitalized himself on /b/.
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>>8096022
huh? I just grabbed the first image from google images when I googled "make crystals".

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https://youtu.be/eU1qsikrBOk
19 posts and 1 images submitted.
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>>8096011
the best hangover cure is not to drink
the second best cure is to drink as much water as you drink

if you think it's lame to drink water in between drinks, you're too immature to drink responsibly.
>>
Drinking water is for sukers lol
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>>8096015
>responsible drug use meme

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What are some books you read that actually inspired you to pursue what you're doing today?
29 posts and 5 images submitted.
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none
I find that something is truly yours when it arises within you without a lot of external influence, but because it makes you shiver or it makes you curious.
Only women and people who like to read like to get their ideas from others.
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>>8095997
The way of the superior man
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>>8096007
Dale Carnegie was passionate about human interaction and communication, he read every book on the subject and every biography of great leaders he could get his hands on.

Tesla was such an avid reader that he would memorize books and got up to a point where he even looked into HInduism texts for inspiration.

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Let's say I just got shot in my leg (thigh, no bone). How do I fix my wound without going to the hospital, and without needing too many instruments and drugs? Do I have any chance to clean and close the wound without infections and whatnot?
12 posts and 1 images submitted.
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>>8095966
no.
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>>8095966
That movie was good ok
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>>8095969
You know when he puts gun powder on that huge nasty cut on his throat then lights it up? Would that really work in any way?

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Hi guys i'd like to share some of my lame undergrad simulations with you, I guess we could share some shit we did in this thread.
Be aware that my gifs will be pretty shitty cause I just learned how to do them.

Also they will be in portuguese because it is my main language.

The first one is a magnus effect simulation, the balls are exactly the same, except that the light blue ball has zero angular momentum while the dark one has non zero. Perspective is bad in this one.
34 posts and 16 images submitted.
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not something I did

>bovine aerodynamics
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In this one I tried to recreate this situation
https://www.youtube.com/watch?v=5ZnKIPfIhAQ

Just pretend there is a rope linking them like in the video. The mass that starts below has 80kg while the other ones 8kg if I remember well... There is no resistive force and the rope is not rolling on the rod. I tried to set the initial conditions similar to the ones in the video.
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this one is a wave function spreading in a square barrier
>>8095865
Wow thats impressive, I really hope I have this much of free time if I ever get a job

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What substitution would i use for

the integral of (Sec(x)^9)(tan(x)^3)
25 posts and 4 images submitted.
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>>8095853
substitute >>>/hm/ for >>>/sci/ for homework threads
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>>8095855
ah thanks
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>>8095853
cos(x) = u
-sin(x)dx = du
sin^2(x) = 1 - cos^2(x)

Anyone have any recent research on the lasting effects of alcohol?

We all know extended periods of heavy drinking can lead to brain damage, and this damage can take years to be restored. What is heavy drinking though? A year of getting wasted every night? Or as little as a single week of extreme binging?

What about lighter drinking?
Is nightly red wine a myth?
Does having a single beer a night do anything harmful?
IQ?
25 posts and 2 images submitted.
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There are studies that show a glass of wine a day is actually beneficial, so I'm sure alcohol, like almost every other edible substance, is healthy only in moderation.

I can only think of substances like lead or mercury that do damage to you without a lower limit on their concentration. These are substances that are not healthy in any amount. Alcohol is alright as long as its in moderation tho.
>>
>>8095721
>What is heavy drinking though?
Defined as 5 drinks a day for males and 3 drinks a day for females.

>A year of getting wasted every night?
Defined as 5 drinks a day for males and 3 drinks a day for females.

>Or as little as a single week of extreme binging?
Defined as 5 drinks a day for males and 3 drinks a day for females.

>What about lighter drinking?
Studies go back and forth arguing garbage correlation/causality points and generally doing poor science. From my own poking around, negative affects stem from binge-ing and the accompanying "kindling" effect (google that term), as well as malnutrition. Light drinking can disturb your sleep if you have the drink immediately before sleeping, which will affect your quality of sleep (and so would translate into the same effects as shit sleep)

>Is nightly red wine a myth?
From the above, you can certainly have red wine nightly. It will probably do fuck all one way or another. Have it if you enjoy it.

>Does having a single beer a night do anything harmful?
See above.

>IQ?
It's a garbage measurement, but figure that unless you're wrecking your liver, the only negative effect would be busting up your sleep. This would affect your problem solving ability the same as sleeping like shit would in the short term.

Conclusions: Drink light, drink during the day.

P.S. It is a known and acknowledged carcinogen though.
>>
>>8095741
>Defined as 5 drinks a day for males and 3 drinks a day for females.
I know you were trying to make a point, but it did not answer my question. If someone had 5 drinks one night and never drank again. Does that person now have to wait a whole year for the effects to go away?

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Is there a plant that grows fluid that can be turned into a lightable?
11 posts and 1 images submitted.
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Kys
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>>8095639
>kiss your sister

Back to /b/ with your incest shit.
>>
yeah trees make wood, energy crisis solved

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Anyone know anything about neuroscience here?

I took on a stressful job recently, so I started playing chess online in my spare time - 20 games a day, for two weeks. A few days ago I started getting splitting headaches when I tried to play chess. Last night I woke up at 4:00 am and my brain was on fire. I thought I was having an aneurysm. I could not stop thinking/dreaming about chess. Easily the worst headache I've ever had.

I know I need to take a break, but what causes this to happen?
14 posts and 1 images submitted.
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>Anyone know anything about neuroscience here?
no. literally no one here does. you'll just get googled answers which you can easily find yourself.
stop being lazy.
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>>8095632
I mostly did pharmacology/drug chemistry, but I had to take some neuroscience, I wouldn't say I really know it, though.

Anyway, this could be something like migraines (did you also notice a very heightened (to a painful degree) sensitivity to sights and sounds?). If not, it sounds like what is called a thunderclap headache (https://en.wikipedia.org/wiki/Thunderclap_headache). You need to go to a doctor now. Statistically, it probably isn't a subarachnoid hemorrhage (anyeurism bursting in your brain), but if it is you're fucked unless you immediately seek attention. Did you vommit? That's another sign of a SA hemorrhage. Subarachnoid hemorrhages also generally come with what are called "sentinel headaches," which are headaches that are super severe, an often happen a couple weeks or days before the hemorrhage itself. If it's stress this could be a hypertensive emergency (high blood pressure causing the pain), which is also really not fucking good.

Another possibility is cluster headaches. How old are you and have you ever smoked (tobacco)? They generally last for an hour of less and are located on one part of the head (https://en.wikipedia.org/wiki/Cluster_headache).

tl;dr: go to a doctor and get some scans if the doctor feels it's necessary.
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i dont know anything technical, but I've heard that playing mental chess in excess can literally make you go insane. Google whoever has the record for most simultaneous games played mentally and you'll find some stuff on this.
I'm sure you get my point and how it's relevant.

Is it possible to scientifically determine the most attractive proportions of a human face?
28 posts and 5 images submitted.
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Something something golden ratio.

The greeks solved this one long ago, friend.
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>>8095587
OP search this. Fascinating topic
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>>8095580
What's wrong with her lip?

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What are some cancers and anti-cancers you know of?

I know that cigarettes and processed meats have been proven to cause cancer.

And I know that exercise and vegetable juice are anti-cancers.

Is there anything you would like to add to the list?
20 posts and 2 images submitted.
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>>8095451
Even fit people can get cancer, anon.
Cancer is just a mutation, you can't anti-cancer anything. You can decrease your risk by not exposing yourself to certain mutagens, but mutagens will forever always be around you.
You can also increase the chances of getting cancer by ingesting or being around mutagens, which increased the chances of a cell mutating into an immortal hellspawn that wrecks havoc upon your entire body. The chances of cancer 'cure' is probably going to impossible without a better early warning system. There's just no such thing as a "anti-cancer"
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>>8095451
Google "known carcinogens"
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>>8095482
it is an anti-cancer in that it reduces your risk. But increasing your intake of that anti-cancer to ridiculous levels doesn't make you cancer proof, no.

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In science, everything is made by monkey men. Why are people so competent at some things but at the same time so utterly retarded?

I think the most maddening thing on Earth has to be anything academic that is constructed by "scientists" or similar animals.

For instance, algorithms, complexity theory, etc it is all done by utter morons I don't consider to be human.
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look at how retarded this representation is.
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>>8095412
Just FUCK my shit up senpai

>let's hide every pattern
>let's make this shit obtuse as fuck
>let's not represent it in a meaningful way

muh fucking academics
monkeys
>>
what do you consider yourself to be?

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Why are monkeys so superior to humans in terms of strength and athleticism - to the point that your everyday primate can outperform world class athletes?

At what point during our evolution did it make sense to abandon such traits?
49 posts and 3 images submitted.
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Yeah, monkeys and other primates are totally ruling the world with their big muscles
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>>8095366
BLACKED
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>>8095356
>monkeys so superior to humans in terms of strength
Wait, is this like the thing with ants?
"If an ant was as big as a human, they could lift a car!"
Cause that shit is pure bullshit.
An ant scaled to human size would collapse under it's own weight.
Fuck ants.

Are these things safe? Am I going to burn my house down?
15 posts and 1 images submitted.
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i mean the 3rd prong is there for a reason
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>>8095271
Not an EE, but I can tell you what to google to research it on your own: ground vs neutral.
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>>8095296

The OP pic has a ground tho, right? You unscrew the outlet plate and plug in the adapter with the screw in the blue bracket.

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hello you smart autists this is /k/ how do railgun works and how can we make them fire cosmoline please translate this to american thank you
Discuss.
38 posts and 5 images submitted.
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>>8095188
Basically they use electromagnetic fields to propel a projectile at high hypersonic velocites, due to the laws of physics this would produce a very strong recoil effect making them impractical as hand held weapons unless you like your arm being blown off. Still the overall damage is higher than a chemically propelled projectile.
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>>8095193
>eletromagnetic fields
so why exactly isnt the gun firing at a constant rate? like it's a full auto thing?
i thought there was no on/off switch for magnets?
and how can it fire cosmoline?
serious question.
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>>8095198
The entire point of the rail gun is to rapidly turn magnets on and off, so that the projectile is attracted forward by the magnets ahead of it but not attracted bacwards by the magnets behind it.

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