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/sci/ - Science and Mathematics

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 No.34[Reply]

Welcome to /sci/. If you're here for homework help go to >>>/hwk/. If you're here for religion or politics, fuck off.

Post last edited at


File: cb72d7df7bb4c3d⋯.png (16.67 KB, 120x68, 30:17, IQ-Mindware-logo-1.png)

 No.5453[Reply]

has anyone tried/ have any idea if these things work?

https://www.iqmindware.com/brain-training-apps

https://www.brainhq.com/why-brainhq/brain-training-your-way/brainhq-courses

any other resources I should look into?

 No.5459

The basics:

Get enough sleep. Sleep dep gives you brain damage. (The book Why We Sleep is a great resource.)

Get enough exercise. Cardio literally grows new brain cells. (https://en.wikipedia.org/wiki/Neurobiological_effects_of_physical_exercise)

Make sure you aren't suffering from chronic inflammation.

If you feel depressed, anxious, forgetful, distracted, lack willpower, there's a good chance you are.

Inflammation has a devastating effect on the brain.

Inflammation means your immune system is pissed off.

You usually experience it when you're sick, but certain foods cause it too.

Refined sugars, vegetable oils, omega-6, and in some cases, carbs in general.

I didn't realize what a huge difference it made until it went away. And when I broke the diet to see what would happen, I felt like absolute shit, and couldn't believe I used to live like that all the time.

An easy way to check, is to stop eating everything inflammatory for a few days and see how you feel.

I recommend the beef-only diet (no, you won't die), but beef and greens should work in most cases.

Once you stop giving yourself brain damage, check out Dual-N Back. It trains your working memory.

Best wishes


 No.5461

>>5459

thanks anon.

how long have you been doing dual-n-back?

did you notice any effects?


 No.5511

>>5459

>check out Dual-N Back. It trains your working memory.

Good advice aside from this. The opinion on this is mixed: https://www.gwern.net/DNB-FAQ#criticism


 No.5512

>>5511

can you summarize the criticism? I don't feel like reading all of it.


 No.5525

bymp




 No.5515[Reply]

So, … the Chinese landed a rover on the 'Dark' side of the Moon.

They claim the Moon rotates just once for each rotation around the sun. They say it is explained by the phenomenon of 'tidal locking.' If tidal locking is a thing, why is the Earth not tidally locked to the Sun?! Earth spins ~ 12 times each rotation around the Sun.

Any legitimate explanation for this? I have been looking but it seems physicists are busy with other stuff. (I am just a Chemist and Engineer - I don't get it)

 No.5516

YouTube embed. Click thumbnail to play.

What flavor chemist and engineer are you? O do you mean chemical engineer?

Either way you are going to want to work on your google skills.


 No.5518

There is no dark side of the moon. Try looking up at night, you always see the same face and sometimes it's dark sometimes it's lit.

Tidal locking happens because of friction bleeding away angular momentum. It takes a long time. Earth isn't there yet. For whatever reason moon locked faster.


 No.5523

>>5515

The time it takes for the moon to orbit Earth is the same time it takes the moon to rotate. This is why it’s tidally locked.

>>5515

>If tidal locking is a thing, why is the Earth not tidally locked to the Sun?!

Earth is to far from the Sun.

>>5516

>What flavor chemist and engineer are you? O do you mean chemical engineer?

He’s a brainlit. I knew what this was when I was twelve.




File: e90336aa1f24b27⋯.png (95.04 KB, 616x174, 308:87, sci.png)

 No.5448[Reply]

Is this beautiful trap really going to teach me about Quantum Physics? Or is it a scam?

3 posts omitted. Click reply to view.

 No.5487

her videos are good for jerking off, not much else


 No.5490

She is such a ditz and admits herself that she squandered her undergrad years and doesn't even know basic computer science.


 No.5494

More like cumton jizzics


 No.5520

>>5448

is she really a trap?


 No.5522

File: f1fb1fdb68cfcaa⋯.jpg (135.04 KB, 700x700, 1:1, 27-food-review1.w700.h700.jpg)




File: 97c886e5f457435⋯.gif (25.91 KB, 672x864, 7:9, h-bomb schematic.gif)

 No.5482[Reply]

has anyone here ever successfully created an atomic weapon?

 No.5513

fuck off fbi fag

go tell government to bomb Iran some more


 No.5521

What is magnetism


 No.5524

>>5482

An "atomic bomb" could literally be a dirty bomb: uranium and a few sticks of dynamite. Would make a city uninhabitable for generations. Don't do that though.




File: b901a089a6f9f8a⋯.png (90.5 KB, 645x729, 215:243, brainlet.png)

 No.4963[Reply]

I have n number of marbles and n ≤ 100. If I group the marbles into some groups of three, I will have

2 marbles left that belong to no group. If I group the marbles into groups of five, I have no marbles

left. But when I group them into groups of seven, I will have 4 marbles left. How many marbles that I

actually have? In other words, determine the value of n

24 posts and 5 image replies omitted. Click reply to view.

 No.5450

>>5433

I'm sorry. I genuinely don't get the joke here.

Are you praising him for still using C or are you mocking him?


 No.5451

>>5431

How does one algebraically solve this problem without any blind trial and error?


 No.5468

>>5428

anon, I know you already found the answer (and probably aren't checking this board anyways) but the lines wouldn't use the same variable, because the number of groups of 3, groups of 5, etc. are going to be different. It's y (the solution) that will be the same between them.


 No.5478

File: 272c74fe7b99ec9⋯.png (69.93 KB, 645x729, 215:243, gmrww8q64syz.png)

I guessed 80. But the 95 guy's post showed that I was a brainlet.


 No.5517

>>5441

that code doesn't even work. those if statements are outside of the for loop.




File: 55a952879986bab⋯.png (40.09 KB, 554x602, 277:301, TIMESAND___762wet2c sut8wd….PNG)

 No.5514[Reply]

As a corollary in this paper, one finds a remarkable disproof of the Riemann Hypothesis.

>Real Numbers in the Neighborhood of Infinity

>http://www.vixra.org/abs/1811.0222



 No.5495[Reply]

Anons, whats the easiest way to determine what sub-field I want to go into? I'm doing physics and don't know what direction I want to go. Quantum seems too pop-sci but classical mechanics doesn't seem to have a lot of job openings. I heard high-energy physics is good, but I wanna hear your opinions on either finding a field or just on this subject.

1 post omitted. Click reply to view.

 No.5504

>>5499

Independent funding or government funding? I saw that the US was cutting theirs in favor of computing.


 No.5507

>>5504

Private funding, there are ~5 labs racing to be the first but as it's fusion they could be racing for a long time.


 No.5508

>>5507

ah, thanks anon


 No.5509

>>5495

are you not already interested in something? or do you like a broad range of things which makes it hard to decide what exactly you want to do?

IMO you should just do what you like doing, but of course you don't want to get yourself into a dead end career.


 No.5510

>>5509

Yeah, it's from broad range of topics I like, and I'll keep my options open (majoring in math with stats minor) and prob look into fusion like the above anon said.




File: 26c9d93561824d7⋯.png (578.51 KB, 999x1031, 999:1031, MathematicaSpikeyVersion8.png)

 No.5469[Reply]

What are some good trackers for academic software?

 No.5493

bump


 No.5501

None that I know of. Most of the academic software I use of is open source anyways. Mathematica is pretty nice though. Are you looking for anything specific because I know Mathematica is on a whole bunch of public trackers.

First post on this board so you better reply back faggot.


 No.5505

>>5501

not OP, but which ones do you use?


 No.5506

>>5505

SciPy, OpenFoam, and OpenSCAD to name a few though then again I am unsure if you would call those academic software. It is what you make of it. Check out http://openscience.org/software/ if you are looking for more. Site is a little out of date but if there is a project that is dead it is fairly easy to find someone that took of the reigns and forked it.




 No.5500[Reply]

so, for a true random coin flip the possible outcome of patterns is 2^n coin flips.

but what happens if i hard code an even distribution of heads and tails?

for a reasonable small n i can calculate it by hand.

e.g. n=2 coin flips:

either HT or TH compared to the true random TT, TH, HT, HH.

i've cut the possible outcomes by exactly half.

for n=4 coin flips:

HHTT, HTHT, HTTH, THTH, THHT, TTHH

6 out of the 2^4 possible outcomes. the amount of possible outcomes compared to true randomness keeps shrinking the more i increase n.

i'm pretty sure this is trivial for most, but i couldn't find the formula for n coin flips. i've calculated (ok, ok, i counted) a bit higher n's on paper via binary trees. tryed to look up a formula, but couldn't find one – prolly just missing the right wording for the question.

can someone help? (and maybe explain, not just give answer)

 No.5502

If you've ever heard of the choose function, often written something like this (imagine the parentheses are one giant parenthesis).

>(n)

>(m)

It basically stands for the number of ways to choose 3 distinct items out of a bucket of six items, regardless of the order. It's actually a shorthand for this equation.

>(n!)/[m! * (n - m)!]

As for why it's this, you can first think about the number of ways to pick the first "m" out of a set of "n" distinct items, where the order matters. This is essentially

>n * (n - 1) * (n - 2) * … * (n - m + 1) *

Since there are "n" ways to pick the first item, "n - 1" ways to pick the second, and so on. If you think about it, this is essentially

>1 * 2 * 3 * … * (n - m - 1) * (n - m) * (n - m + 1) * … * (n - 1) * n [This is n!]

←—————————–(Divided by)————————————–

>1 * 2 * 3 * … * (n - m - 1) * (n - m) [This is (n - m)!]

Which can be written as n! / (n - m)!

Finally, since we don't actually care about the order in which we picked the items, we can divide it by the number of items we picked, which is "m!". Thus we get

>[n! / (n - m)!] / m! = n! / [m! * (n - m)!]

Here's another way to think about this. The number of ways we can arrange "n" numbers is n!. After arranging our numbers, we put the first "m" items in one set and the remaining "n - m" items in another. Since we don't care about the order of the first "m" items, we divide n! by m!. But we also don't care about the order of the "n - m" items we didn't pick, so we divide it by (n - m)! as well.

Keep in mind this means that picking "m" elements out of "m" is the same thing as picking "n - m" elements out of "n". In other words:

(n) = (n)
(m) = (n - m)

So to finally answePost too long. Click here to view the full text.


 No.5503

File: cba7478d60aae61⋯.png (179.86 KB, 1000x700, 10:7, Yui umarm.png)

>>5502

thank you




File: 655884378c7a71a⋯.jpeg (68.29 KB, 640x494, 320:247, 2BD0E3D0-0F0C-45A7-A25C-7….jpeg)

 No.5496[Reply]

So get this. I look into the vaccine debate extensively. I look at all sides and I notice how all the anti-vaxxers are conspiracy theorists from conspiracy website circlejerks. I come to have faith in my country’s public health organization and all other countrie’s public health organizations and of course, my public schools, because the whole world’s public health orgs and schools teach the same thing in regards to the safety and effectiveness of vaccines… So I think I’m ready, and I can debate anyone with confidence.

Then a friend of my close friend says his cousin got some sort of trauma that resulted in a speech impediment, and all credible resources diagnosed it as a vaccine related injury…

My close friend informs me that this is proof vaccines are bad, and that I need to not be so gullible and do better research.

Doesn’t help that I’m fat and autistic and that anti vaxxer friend is in shape and never gets sick despite being a chain smoker.

Which brings us to today’s topic. What is the fine line between being educated and brainwashed? Has anyone else had an instance where reality seems to contradict what is taught in schools? Sometimes research and “educating” myself and others just makes me feel like the ignorant one. I feel useless no matter what I look into and what stance I try to uphold.

 No.5497

>>5496

Most modern vaccines are schemes.

Back in the day it was more a good thing. Some people can't get their arms down from patenting and controlling the prescription of antibiotics and the few vaccines actually solving real pandemics. Along with being legal pushers and pushing extremely harmful prescription drugs over the counter.

The rest is just about dollars. The silver and aluminium the vaccines contain to create a whole-body immunological reaction is extremely volatile and can create a wide range of bad effects from heart failure to an itch in the ass.

Don't mess with them. Take only the really necessary ones.

I wouldn't give my children any in this day and age where I live.


 No.5498

It seems you were looking for a black and white answer in a grey world.

Vaccines greatly increase average life-span and average quality of life but as with all averages there is a lower limit and that is the extremely rare cases where vaccines do harm mostly due to allergic reactions.

>What is the fine line between being educated and brainwashed?

Reason, if you can use critical thinking to support your position that is a good start but keep in mind the universe is under no obligation to make sense (see wave / particle duality ect.).


 No.5519

>Ideas so good, they have to be mandatory.




 No.5486[Reply]

Let's say there's a line of men fucking each other in the ass. The one in the very back (the only one that is not getting fucked in the ass) has HIV. How long until the guy in the front gets HIV, if they continue fucking like this for 600 thrusts an hour?

 No.5492

>>5486

Practically an eternity.

It’s kind of glossing over details but essentially any virus must successfully infiltrate cells and modify their dna before they can begin replicating and producing particles capable of causing disease. This is something like 2-4 days for HIV. So it would have to be a really long orgy.

Plus the actual risk of contracting HIV from an infected individual in one encounter is a lot lower than you might think. I was surprised when I looked it up. I mean you’re still playing Russian roulette but it’s not like all six chambers are loaded.




File: 18af674c328e722⋯.jpg (5.23 KB, 261x193, 261:193, Nanitf.jpg)

 No.5464[Reply]

>Friction is a non conservative force

>Friction arises from electromagnetic forces acting on atoms between two surfaces with relative motion between each other

>Electromagnetic forces are conservative

>MFW

 No.5483

>>5464

Look at how you're defining your systems.


 No.5485

>being a cuckservative

>not being third position


 No.5491

>>5485

Gaddafi was 3rd position and he got stabbed in the butthole




File: 7c3a77f6d7a13e5⋯.jpg (6.95 KB, 480x360, 4:3, hqdefault.jpg)

 No.5413[Reply]

Does 0^0 = 1?

Make your case, why or why not. If not, what should it be defined as?

5 posts omitted. Click reply to view.

 No.5458

>>5413

It’s zero because any fraction where zero is the numerator is zero, is zero.


 No.5462

Lets look Taylor sum of exponential function: [math]\Sigma_{i=0}^\infty x^i /i![/math]

If this make any sense, then 0^0 has to be one since exponent fuction is one at x=0.


 No.5480

>>5413

Zero has no multiplicative inverse.


 No.5488

>>5480

Is this fact the consequence of the fact that zero is the additive neutral element?


 No.5489

>>5421

Generally,

0/0 = x

x*0 = 0

for any real x. Therefore, any real x is a valid value for 0/0. Therefore, 0/0 is indeterminate (as is does not correspond to a specific number).




File: 0714fe7e8bd9517⋯.png (3.79 MB, 1920x1080, 16:9, ClipboardImage.png)

 No.5484[Reply]

I hope this isn't taken as profane by the scientists around here, so I have been watching this show and the interesting thing about its premise has been how most powers seem to come with a certain amount of drawbacks, of course there are a lot of those which completely break the rules but some others may seem OK.

So… let's say there are a few ideas for powers that I would like to write about or explore for whatever reason, I would like some real basis for them, this still can sound overpowered for all intents and purposes but let's try it.

What if there was this character whose power basically meant: This guy is a human particle accelerator/collider? what kind of things come to mind with such a premise other than to ask me to kill myself?



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