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# /sci/ - Science & Math

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

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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

 >> Anonymous Mon 26 Oct 12:28:20 2020 No.12274852 Quoted By: >>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.
 >> Anonymous Mon 26 Oct 12:31:42 2020 No.12274857 Quoted By: Isn't that just gonna form an amalgam and do nothing else?
 >> Anonymous Mon 26 Oct 12:33:12 2020 No.12274859 Quoted By: >>12274829 Get out cia

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Quoted By: >>12274834

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

 >> Anonymous Mon 26 Oct 12:17:26 2020 No.12274834 Quoted By: >>12274819 probably when some genius formalizes a correct theory so we can feasibly do experiments

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

 >> Anonymous Mon 26 Oct 11:56:09 2020 No.12274802 File: 40KiB, 647x659, yes.jpg [View Same] [Google] [iqdb] [SauceNAO] Quoted By:

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

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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 ?

 >> Anonymous Mon 26 Oct 11:16:31 2020 No.12274749 Quoted By: >>12274732 Credibility is worth quite a lot if it's the right kind.
 >> Anonymous Mon 26 Oct 11:18:33 2020 No.12274754 Quoted By: >>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
 >> Anonymous Mon 26 Oct 11:21:03 2020 No.12274758 Quoted By: >>12274732 Void of deep understanding of how computers work and why they work, of course you would feel this way.

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/sci/'s thoughts on Melodysheep?

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

 >> Anonymous Mon 26 Oct 10:34:48 2020 No.12274684 Quoted By: >>12274718 popsci cuck shit
 >> Anonymous Mon 26 Oct 10:54:03 2020 No.12274718 Quoted By: >>12274684 Ah well, back to arguing about PEDMAS trolls I suppose.

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

22 posts omitted.
 >> Anonymous Mon 26 Oct 10:55:21 2020 No.12274722 File: 33KiB, 500x332, eskfi.jpg [View Same] [Google] [iqdb] [SauceNAO] Quoted By: >>12274724 >>12274699 Given a sequence $a_k$, the infinite sum in the theory of classical analysis is the number $y$ which fulfills $\forall ( \varepsilon \in {\mathbb R}_{>0} ) . \, \exists ( m \in {\mathbb N} ) . \, \forall ( n \ge_{\mathbb N} m) . \, | \sum_{k=1}^n a_k - y \, |<\varepsilon$ E.g. the number which fulfills $\forall ( \varepsilon \in {\mathbb R}_{>0} ) . \, \exists ( m \in {\mathbb N} ) . \, \forall ( n \ge_{\mathbb N} m) . \, | \sum_{k=0}^n \dfrac{1}{2^k} - y \, |<\varepsilon$ is $y=1$. 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 $\sum_{k=0}^N (-1)^k$ . 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 $d \in (0,1)$, then classical analysis (use the geometric series) proves $\sum_{n=0}^\infty (-1+d)^n=\frac{1}{1-(-1+d)} = \frac{1}{2-d}$ 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 $\sum_{k=0}^N (-1)^k$ 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.
 >> Anonymous Mon 26 Oct 10:56:35 2020 No.12274724 Quoted By: >>12274722 lower bound of the second expression should have been k=1
 >> Anonymous Mon 26 Oct 10:57:56 2020 No.12274728 File: 16KiB, 460x322, 7of9.jpg [View Same] [Google] [iqdb] [SauceNAO] Quoted By: >>12274738 >>12274699 Given a sequence $a_k$, the infinite sum in the theory of classical analysis is the number $y$ which fulfills $\forall ( \varepsilon \in {\mathbb R}_{>0} ) . \, \exists ( m \in {\mathbb N} ) . \, \forall ( n \ge_{\mathbb N} m) . \, | \sum_{k=1}^n a_k - y \, |<\varepsilon$ E.g. the number which fulfills $\forall ( \varepsilon \in {\mathbb R}_{>0} ) . \, \exists ( m \in {\mathbb N} ) . \, \forall ( n \ge_{\mathbb N} m) . \, | \sum_{k=1}^n \dfrac{1}{2^k} - y \, |<\varepsilon$ is $y=1$. 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 $\sum_{k=0}^n (-1)^k$ . 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 $d \in (0,1)$, then classical analysis (use the geometric series) proves $\sum_{n=0}^\infty (-1+d)^n=\frac{1}{1-(-1+d)} = \frac{1}{2-d}$ 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 $\sum_{k=0}^N (-1)^k$ 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.
 >> Anonymous Mon 26 Oct 10:59:32 2020 No.12274730 Quoted By: I use n and N interchangably there
 >> Anonymous Mon 26 Oct 11:04:21 2020 No.12274738 Quoted By: >>12274728 Thanks

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Who has the highest recorded IQ?

And what is the highest possible?

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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?

 >> Anonymous Mon 26 Oct 09:41:18 2020 No.12274570 File: 22KiB, 400x462, 1603673151670.jpg [View Same] [Google] [iqdb] [SauceNAO] Quoted By: 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
 >> Anonymous Mon 26 Oct 09:43:03 2020 No.12274575 Quoted By: 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.
 >> Anonymous Mon 26 Oct 09:53:32 2020 No.12274598 File: 18KiB, 835x367, images - 2020-10-26T074847.392.jpg [View Same] [Google] [iqdb] [SauceNAO] Quoted By: Hey, you are probably autistic. Your story reminded me of this video: https://youtu.be/5lXbpgU9OWk
 >> Anonymous Mon 26 Oct 09:55:26 2020 No.12274603 Quoted By: 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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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?

 >> Anonymous Mon 26 Oct 08:59:42 2020 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.
 >> Anonymous Mon 26 Oct 09:06:30 2020 No.12274514 Quoted By: >>12274505 it's the gravitational analog to unruh radiation https://en.wikipedia.org/wiki/Unruh_effect#Unruh_radiation
 >> Anonymous Mon 26 Oct 09:48:19 2020 No.12274588 Quoted By: >>12274496 escaping photons
 >> Anonymous Mon 26 Oct 09:52:19 2020 No.12274595 Quoted By: mathematical bullshit mostly. if you put your cock near one you'd end up with a paraboloid for a dick.

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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.
 >> Anonymous Mon 26 Oct 09:05:35 2020 No.12274512 Quoted By: But isn't the shade past that point a function of intensity??
 >> Anonymous Mon 26 Oct 09:06:44 2020 No.12274515 Quoted By: >>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.
 >> Anonymous Mon 26 Oct 09:12:24 2020 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
 >> Anonymous Mon 26 Oct 09:16:59 2020 No.12274529 File: 211KiB, 722x312, imKvsJL.png [View Same] [Google] [iqdb] [SauceNAO] 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
 >> Anonymous Mon 26 Oct 09:49:34 2020 No.12274591 Quoted By: >>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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Quoted By: >>12274648 >>12274719

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

3 posts omitted.
 >> Anonymous Mon 26 Oct 09:49:58 2020 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.
 >> Anonymous Mon 26 Oct 09:59:20 2020 No.12274608 Quoted By: >>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.
 >> Anonymous Mon 26 Oct 10:19:11 2020 No.12274648 Quoted By: >>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
 >> Anonymous Mon 26 Oct 10:42:18 2020 No.12274700 Quoted By: make better choices
 >> Anonymous Mon 26 Oct 10:54:21 2020 No.12274719 Quoted By: >>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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Quoted By: >>12274470

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

 >> Anonymous Mon 26 Oct 08:18:00 2020 No.12274470 Quoted By: >>12274490 >>12274467 speed is a scalar, velocity is a vector
 >> Anonymous Mon 26 Oct 08:40:14 2020 No.12274490 Quoted By: >>12274494 >>12274495 >>12274470 >velocity is speed with a direction >velocity is speed
 >> Anonymous Mon 26 Oct 08:47:02 2020 No.12274494 Quoted By: >>12274490 Yes, you grasped it perfectly. So whence the shitpost?
 >> Anonymous Mon 26 Oct 08:49:38 2020 No.12274495 File: 16KiB, 295x359, smurt.png [View Same] [Google] [iqdb] [SauceNAO] Quoted By: >>12274490 - you're smart for a worm - yay i'm smurt!

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

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Quoted By: >>12274367

what is the math for Smartphone Engineering?

 >> Anonymous Mon 26 Oct 06:57:49 2020 No.12274367 Quoted By: >>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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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

 >> Anonymous Mon 26 Oct 06:52:06 2020 No.12274356 Quoted By: >>12274379 >>12274338 It's literally autistic cope. >lol I am ancient Lakota clown! Ecks Dee!
 >> Anonymous Mon 26 Oct 07:05:00 2020 No.12274379 File: 104KiB, 800x600, 1 Km98PgzRp9yRYfVZeSzwzQ.png [View Same] [Google] [iqdb] [SauceNAO] Quoted By: >>12274381 >>12274356 >Ecks Dee! >XD what did he mean by this?
 >> Anonymous Mon 26 Oct 07:07:23 2020 No.12274381 Quoted By: >>12274379 he's from reddit and needs to go back

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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.
 >> Anonymous Mon 26 Oct 06:41:38 2020 No.12274334 Quoted By: >>12274322 >social “““science”””
 >> Anonymous Mon 26 Oct 06:44:54 2020 No.12274341 Quoted By: >>12274324 i do lmao
 >> Anonymous Mon 26 Oct 06:47:44 2020 No.12274347 File: 120KiB, 711x735, ex.jpg [View Same] [Google] [iqdb] [SauceNAO] Quoted By: >>12274322 >voluntarily brainwashing yourself why?
 >> Anonymous Mon 26 Oct 06:54:07 2020 No.12274359 Quoted By: >>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
 >> Anonymous Mon 26 Oct 07:21:31 2020 No.12274396 Quoted By: >>12274322 I think that would push me to fascism. Have you seen the state of leftists on Twitter?

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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.
 >> Anonymous Mon 26 Oct 09:07:33 2020 No.12274517 Quoted By: >>12274314 acting like a jerk and killing your parent
 >> Anonymous Mon 26 Oct 09:08:38 2020 No.12274518 Quoted By: >>12274543 >>12274314 acting like a jerk and killing your parents
 >> Anonymous Mon 26 Oct 09:25:06 2020 No.12274543 Quoted By: >>12274518 this Also, more or less permanent loss of smell
 >> Anonymous Mon 26 Oct 10:22:50 2020 No.12274658 Quoted By: >>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.
 >> Anonymous Mon 26 Oct 10:24:26 2020 No.12274662 Quoted By: >>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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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.

 >> Anonymous Mon 26 Oct 06:23:58 2020 No.12274312 File: 38KiB, 768x768, green-with-envy-nails-2-768x768.jpg [View Same] [Google] [iqdb] [SauceNAO] Quoted By: >>12274315 Apply directly to eyeball
 >> Anonymous Mon 26 Oct 06:28:39 2020 No.12274315 Quoted By: >>12274312 I laughed, just a bit though
 >> Anonymous Mon 26 Oct 09:38:13 2020 No.12274564 Quoted By: colored contact lenses

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Quoted By: >>12274659

Where can I find more material like this?

Bonus points for any reports of mathematical disasters.

 >> Anonymous Mon 26 Oct 10:22:58 2020 No.12274659 Quoted By: >>12274266 Look for the Bhopal disaster

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