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/sci/ - Science & Math


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12274861 No.12274861 [Reply] [Original]

Are highschool grade prediction tests (CATs) taken age ~11, like the MIDYIS test, more important than the grades they actually predict, like GCSEs?
So if you got predicted like all A*s, but only achieved a mix of Bs and As, are the predicted grades more important?



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12274851 No.12274851 [Reply] [Original]

Guys please where can I find this retarded book's 4th edition pdf I already checked libgen



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12274829 No.12274829 [Reply] [Original]
Quoted By: >>12274852 >>12274859

I'm new to this site so be patient. I want to sythesize some nitric acid for home experiments(no explosives so no worries) and wanted to ask what are some cheap and quick methods to make some decent yeald and quality stuff? PS: other methods other than ammonium nitrate and sulphuric acid reaction cuz that s to easy lol

>> No.12274852

>>12274829
Drop gold into mercury, be careful not to get poisoned by either, I can't remember the formula but what you need will come out.

>> No.12274857

Isn't that just gonna form an amalgam and do nothing else?

>> No.12274859

>>12274829
Get out cia



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12274819 No.12274819 [Reply] [Original]
Quoted By: >>12274834

>string theory
>loop quantum gravity
>causal dynamic triangulation
>causal sets
When are we going to figure out quantum gravity?

>> No.12274834

>>12274819
probably when some genius formalizes a correct theory so we can feasibly do experiments



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12274796 No.12274796 [Reply] [Original]

>forget to mute my mic in zoom class
>"...excuse me, did someone just call me a bitch nigga?"

>> No.12274802
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12274802



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12274751 No.12274751 [Reply] [Original]

>What do you mean Agent Orange isn't actually orange?



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12274732 No.12274732 [Reply] [Original]

Just joined my first class of C today ( Hello world and stuff ) in my uni and i want to ask ... Is IT is just a meme ? Is it even worth it at this point ? And 4 years should be enought for me to masterd 3-4 langue right ?

>> No.12274749

>>12274732
Credibility is worth quite a lot if it's the right kind.

>> No.12274754

>>12274732
going to school just for computer science is a waste. however, knowing how to develop software is useful in almost any field these days. CS is a great minor, just pair it with some application as your major

>> No.12274758

>>12274732
Void of deep understanding of how computers work and why they work, of course you would feel this way.



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12274671 No.12274671 [Reply] [Original]

/sci/'s thoughts on Melodysheep?

I just wish Symphony of Science was still going. The new documentary-type vids are pretty, though.

>> No.12274684
Quoted By: >>12274718

popsci cuck shit

>> No.12274718

>>12274684
Ah well, back to arguing about PEDMAS trolls I suppose.



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12274605 No.12274605 [Reply] [Original]

We are trying to have lucid dreams;we have read and heard,that:
)The center of balance in the ears creates the illusion for the brain,that the body is still awake
and that,due do this,lucidity(in dreams)almost surely ensures should one fall asleep while sitting.
Is this all true?
what are the scientific dream benefits of upright sleep?



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12274573 No.12274573 [Reply] [Original]

Hey /sci/. How can the sum of all positive integers be -1/12?

22 posts omitted.
>> No.12274722 [DELETED]
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12274722
Quoted By: >>12274724

>>12274699
Given a sequence , the infinite sum in the theory of classical analysis is the number which fulfills



E.g. the number which fulfills



is .
That theory has a geometric model, i.e. it has some intuition and known applications.
There are other theories of infinite sum.

E.g. consider the (finite!) sum .
The theory of classical analysis doesn't assign a value to this sum, for every growing N.
The sum diverges, is what we say.

Now take a positive , then classical analysis (use the geometric series) proves



The limit of d to 0 of this sum is 1/2, but in analysis you can't switch the limits (because the limit is a ugly logical expression you saw above).

Other theories will straight out prove that the infinite sum is 1/2. Not standard theories you learn in school.
There are also regularizations of the initial finite sum (modifications of the original sum, usually with an extra parameter) depending on the bound N. Those (different!) regularized sums also converge to 1/2.

Quantum field theory does this all the time - adding extra dependent parameters on small, not yet observable scales to theories in hope convergence is improved.
As in, instead of trying the old to model physics, what's done is using a (usually more complicated) different thing and conjecturing that the world is actually better described by the regularized version of it.

>> No.12274724 [DELETED]

>>12274722
lower bound of the second expression should have been k=1

>> No.12274728
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12274728
Quoted By: >>12274738

>>12274699
Given a sequence , the infinite sum in the theory of classical analysis is the number which fulfills



E.g. the number which fulfills



is .

That theory has a geometric model, i.e. it has some intuition and known applications.
There are other theories of infinite sums.

E.g. consider the (finite!) sum .
The theory of classical analysis doesn't assign a value to this sum - for n going to infinite.
The sum diverges, is what we say.

Now take a positive , then classical analysis (use the geometric series) proves



The limit of d to 0 of this sum is 1/2, but in analysis you can't switch the limits (because the limit is a ugly logical expression you saw above).

Other theories will straight out prove that the infinite sum is 1/2. Not standard theories you learn in school.
There are also regularizations of the initial finite sum (modifications of the original sum, usually with an extra parameter) depending on the bound N. Those (different!) regularized sums also converge to 1/2.

Quantum field theory does this all the time - adding extra dependent parameters on small, not yet observable scales to theories in hope convergence is improved.
As in, instead of trying the old to model physics, what's done is using a (usually more complicated) different thing and conjecturing that the world is actually better described by the regularized version of it.

>> No.12274730

I use n and N interchangably there

>> No.12274738

>>12274728
Thanks



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12274571 No.12274571 [Reply] [Original]

Who has the highest recorded IQ?

And what is the highest possible?



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12274558 No.12274558 [Reply] [Original]

So what the fuck is my problem?
I passed the admission tests for one of the most popular courses in the best university of my country without studying one single second. My score was actually so good I managed to make it into the top 5% of that year. I have always aced every test without studying, and still do. Got scholarships without studying, medals at scientific olympiads, yada yada yada basic shit you're all already tired of hearing from gifted teenagers.
On the other hand, I can't understand very basic things. Like, this one time a girl told me to touch her and I started poking her in her forehead for like a minute until she got super fucking angry at me and left my house. This other time, my father told me to cross the street twice to get to a rotisserie while he talked to his friend that we coincidentally stumbled upon, by which he meant I should cross the street right in front of me and then cross the other one, and what did I do? I crossed the street and crossed back to where I was, DESPITE BEING ABLE TO SEE WHERE THE ROTISSERIE WAS. I didn't understand how crossing it and then crossing it back would get me to the fucking rotisserie, but I trusted him. And they laughed at me for dozens of minutes after that. Understandably. I have a lot of examples of people telling me to do simple things and me not being able to understand what they mean.
So what the fuck is wrong with me?

>> No.12274570
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12274570

Forget about serving other people, retard,
do what you desire.
if the girl told you to touch her, you should do what you want to her instead.
if your dad told you to cross the street twice you say
>fuck you faggot that's stupid
STOP BEING A LITTLE BITCH

>> No.12274575

There was also this instance during a school excursion where my teacher told us to tell him if we saw anyone suspicious, and I proceeded to tell him about every criminal I saw on TV for months until he finally asked me why I was always talking about criminals and explained the situation to him. I was in 8th grade.

>> No.12274598 [DELETED]
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12274598

Hey, you are probably autistic. Your story reminded me of this video: https://youtu.be/5lXbpgU9OWk

>> No.12274603

Hey, anon, you are probably autistic. Your story reminded me of this video: https://youtu.be/5lXbpgU9OWk
It's nothing to be ashamed of, your father should be ashamed of laughing at you.



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12274496 No.12274496 [Reply] [Original]
Quoted By: >>12274505 >>12274588

Is it matter from within the blackhole? How exactly does it "evaporate"? Is it escaping the blackhole? Does it not just get sucked back into the blackhole?

>> No.12274505
Quoted By: >>12274514

>>12274496
>Is it matter from within the blackhole?
no
Just outside the EH, part of the gravity field's energy turns into two virtual particles.
They take away 2 units of energy from the gravity field i.e. the black hole.
One of the particles escapes while the other falls in. End result is the gravity field weakening by 1 energy unit.
Weaker field = smaller BH.

>> No.12274514

>>12274505
it's the gravitational analog to unruh radiation
https://en.wikipedia.org/wiki/Unruh_effect#Unruh_radiation

>> No.12274588

>>12274496
escaping photons

>> No.12274595

mathematical bullshit mostly.
if you put your cock near one you'd end up with a paraboloid for a dick.



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12274491 No.12274491 [Reply] [Original]
Quoted By: >>12274524

If the green cone only responds to wavelengths below 660nm does that mean all the visible reds above 660nm all look the exact same to us?

1 post omitted.
>> No.12274512

But isn't the shade past that point a function of intensity??

>> No.12274515

>>12274500
I figured all the cones just have us see 1 color, and it's the ratio between cone signals that decides to color we perceive in a particular point.

>> No.12274524
Quoted By: >>12274529

>>12274491
cones have a spectral response that peaks at what we label as red, green, and blue, but the response overlap to a non-trivial degree.

have you have ever heard of imaginary colors? the idea is that since red and green cones respond to (say) green light, it is impossible to only stimulate the green cones without stimulating the red cones. however, if you wear out your red cones by staring at a red scene, and then switch to a green scene, then you can almost only stimulate the green cones, giving the sensation of a green greener than green

you can fatigue the red cones by staring at a red

>> No.12274529
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12274529
Quoted By: >>12274591

>>12274524
Wow, fatiguing is fascinating

This picture is what got me to ask in the first place

Beyond 660nm the green cone has trivial to no response

>> No.12274591

>>12274529
vision is really interesting. i got into it after studying computer graphics. when you are a kid, you don't stop to ask why particular colors (RGB) are primary colors used in display technologies. i want to put together a computer graphics text that begins with this kind of shit.



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12274485 No.12274485 [Reply] [Original]
Quoted By: >>12274648 >>12274719

Is it possible to go without sleep over 72 hours without the disorientation and hallucinations?

3 posts omitted.
>> No.12274592
Quoted By: >>12274608

>>12274544
I don't see the connection between not over-eating and sleeping. Sleep deprivation actually makes you unnaturally hungry and can make you eat a lot more than usual (and eat more unhealthy food; not sure why but sleep deprivation makes you crave unhealthy things), so it may be a really bad idea.

I recommend trying intermittent fasting. It's the only thing that works for me. If I start eating odds are I'm going to eat a lot, so I just set aside hours to eat nothing and just drink water or organic fruit juice or whatever. (I'm extremely underweight; I just find I tend to binge eat and it ruins my day and makes me tired and makes me crash like you, so I fast a lot to avoid that, which is partly why I'm so underweight. On second thought don't take advice from me I guess.)

>toying with the electricity in my body
No clue what that means, but sounds like woo-woo pseudoscience.

And to actually answer the question, no, 72 hours awake is almost always going to cause profound cognitive problems until you sleep. If you take sporadic naps through it it could be passable, but absolutely no sleep for 72 hours + no disorientation or hallucinations is probably impossible, whether or not you take drugs or eat or don't eat or whatever. It can be kind of fun but you're absolutely going to be disoriented.

>> No.12274608

>>12274592
>No clue what that means, but sounds like woo-woo pseudoscience.
I literally direct the electricity in my body all over the place via stretching/body positioning. This is mostly possible on behalf of diabetic neuropathy or whatever. Ive done lots of fasting, have over-eaten to the point of bleeding from the stomach as well as gastroparesis. I guess it's been a little game i've been playing with my body, over-eat until my body reacts in strange ways and then figuring out how to get back to normal functioning. Been a wild ride.

>> No.12274648

>>12274485
I don't have much data through my experience, but the time I went over 72 hours staying up I didn't experience any hallucinations (I need way more sleep deprivation to get hallucinations and I can't do that without substances and then it's not a "pure" report anymore), but the debilitating effects were quite noticeable and distracting after hitting the 70h mark

>> No.12274700

make better choices

>> No.12274719

>>12274485
The trick with hallucinations is that you don't always realize you're having them. I went hiking above 19,000 feet and started having minor hallucinations. I was seeing words carved into the side of rocks but when I'd go to read them, the words would disappear. The first two times it happened, I thought I was just tired but the third time it happened, I realized I was hallucinating. That was minor and I felt lucid the rest of the day. That night we climbed to the summit and got there around daybreak. We took pictures and since it was so early, we didn't check in at the ranger station.
I was discussing the trip with someone else about a month later and I mentioned the ranger station up at the summit. He was confused and said there was no ranger station. I didn't understand how he could have forgotten it. We pulled up Google Earth and zoomed in to the summit. No ranger station. We asked others who were on the trip and they all agreed there was no ranger station. I had hallucinated it and never ever realized it because it was something that was perfectly rational to have been there and nothing special happened with it.
So you might stay up for days, have hallucinations, and not even realize when they started or that you had them at all.



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12274467 No.12274467 [Reply] [Original]
Quoted By: >>12274470

Speed is literally exactly the same as velocity, why does the scientific community always have to needlessly complicate everything?

>> No.12274470
Quoted By: >>12274490

>>12274467
speed is a scalar, velocity is a vector

>> No.12274490
Quoted By: >>12274494 >>12274495

>>12274470
>velocity is speed with a direction
>velocity is speed

>> No.12274494

>>12274490
Yes, you grasped it perfectly. So whence the shitpost?

>> No.12274495
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12274495

>>12274490
- you're smart for a worm
- yay i'm smurt!



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12274364 No.12274364 [Reply] [Original]

Is the AGP/HSTS actually scientific or is it discredited?



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12274355 No.12274355 [Reply] [Original]
Quoted By: >>12274367

what is the math for Smartphone Engineering?

>> No.12274367

>>12274355
>smartphone "engineering":
Algebra, linear algebra, little bit of calculus.
>smartphone engineering:
Above plus vector analysis, complex analysis, Fourier analysis, ODEs, PDEs, and statistics.



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12274338 No.12274338 [Reply] [Original]
Quoted By: >>12274356

Red piull me on the science of a heyoka empath. How does it work /sci/ bros?

https://videos.utahgunexchange.com/watch/NVoSurjYpVvk8Nh

>> No.12274356
Quoted By: >>12274379

>>12274338
It's literally autistic cope.
>lol I am ancient Lakota clown! Ecks Dee!

>> No.12274379
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12274379
Quoted By: >>12274381

>>12274356
>Ecks Dee!
>XD
what did he mean by this?

>> No.12274381

>>12274379
he's from reddit and needs to go back



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12274322 No.12274322 [Reply] [Original]

Hey /sci/, I did an experiment here are the details if you care.
"Try to become LibLeft from starting views (very very slightly Authright) experiment"
How to: Create new social media accounts, follow leftist political accounts, read leftist articles, read about climate and environmental issues for a period of 3 months.
Check how different you score on the political compass.

1 post omitted.
>> No.12274334

>>12274322
>social “““science”””

>> No.12274341

>>12274324
i do lmao

>> No.12274347
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12274347

>>12274322
>voluntarily brainwashing yourself
why?

>> No.12274359

>>12274322
All perspectives are valid
U can just turn into water and use ur imagination from there
It doesn't take 3 months or articles u can just shift your perspective on the fly

>> No.12274396

>>12274322
I think that would push me to fascism. Have you seen the state of leftists on Twitter?



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12274314 No.12274314 [Reply] [Original]

please give me the ultimate red pill

I'm 30 year old with no health issues
what do I have to fear from corona?

2 posts omitted.
>> No.12274517 [DELETED]

>>12274314
acting like a jerk and killing your parent

>> No.12274518
Quoted By: >>12274543

>>12274314
acting like a jerk and killing your parents

>> No.12274543

>>12274518
this

Also, more or less permanent loss of smell

>> No.12274658

>>12274314
you need to be afraid of the exiting tail risk. any new infected is a new operturnity for the virus to mutate into super chad virus.

the risk is small but the damage is your species.

also personally you may have a blood cloting issue that is unknow in which case you most likely live, but not well.

>> No.12274662

>>12274314
>there's a 1 in 1000 chance of dying from rona
>if you dont take that chance you dont have a soul



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12274277 No.12274277 [Reply] [Original]

Hey /sci/ is there any way a regular person like me could get heterochromia? From what I've seen the only way to get it non genetically is getting some obscure disease or injure myself.

>> No.12274312
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12274312
Quoted By: >>12274315

Apply directly to eyeball

>> No.12274315

>>12274312
I laughed, just a bit though

>> No.12274564

colored contact lenses



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12274266 No.12274266 [Reply] [Original]
Quoted By: >>12274659

https://www.youtube.com/watch?v=Tflm9mttAAI
Where can I find more material like this?

Bonus points for any reports of mathematical disasters.

>> No.12274659

>>12274266
Look for the Bhopal disaster



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12274262 No.12274262 [Reply] [Original]

I'm in a microeconomics course rn and wanna get easy answers for a test, is there an easy way to get an account like chegg or coursehero for free?



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