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Archived threads in /sci/ - Science & Math - 704. page

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What exactly is so controversial about race differences in intelligence?

I'm not talking about this book specifically - it's been criticised by a lot of people, whether justifiably or not.

If IQ tests and other standardised tests are culturally biased, as some people say - is there a single example of a test or academic metric where black people outperform whites (not including basketball)?
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>>8766992
>What exactly is so controversial about race
>>
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>>8766992
https://www.gov.uk/government/collections/statistics-gcses-key-stage-4
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>>8767020
Minorities in Britain would hardly be representative of their original ethnic groups (brain drain etc)

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Physics major here. How do I make the point to a medfag friend who thinks he's god that his area isn't hard?
82 posts and 8 images submitted.
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>>8766913
If you are talking about an undergrad """pre-med""" then you are right. But studying actual medicine is pretty hard, the way it is hard is different than how physics is hard, but it is still hard.
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Remind him that there are way more women in his field than in yours.
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>STEM major: what are you learning in school
>Business major: shapes and colors
>STEM major: lmao good luck getting a job with that
And yet at the end of the day...

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Is there an area of knowledge and research about politics/ social life/ how people think? I mean down to nitty gritty mathematical concepts in the same sense as something like economics attempts to do. Basically away to understand our world in a fairly rational way.
17 posts and 3 images submitted.
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philosophy
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>>8772942
he said rational
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>>8772926
Linguistics.

>t. linguist

So one time while riding a motorcyle down the road a friendly crack decided to make my day, when I was changing lanes my wheel got caught in the crack and in half a second I hit the ground to my immediate left hitting my head(with my helmet) and left side of my body, and I don't remember hitting the ground part, but the next half second the forward force kept dragging me and the motorcycle about 30yrds, I weighed 220 ibs and my motorcycle weighs 385ibs and I was going about the 40 mph, how much force would ya'll say my body recieved when it impacted the concrete road?
14 posts and 1 images submitted.
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including relativistic effects?
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>>8772889
One answer with and one answer without.
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>>8772886
Your forward velocity has nothing to do with the amount of force your body takes when hitting the ground. Unless you were traveling near orbital velocity it makes exactly 0 difference. Assuming you didnt slide into anything, and assuming you were wearing all your gear, the force would be identical to you falling over while at a stop. (I.E. you are a pussy) Also what the fuck is an ibs? What planet you from boy?

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>get accepted into top 10 uni in the world for PhD in physics
>happiness is slowly replaced by realization that I will be paid minimum wage for the next 4 years despite working like a slave
>regret that I didn't apply for managment consulting internships and banking jobs
this was my dream
how do I become happy with what I have?
12 posts and 1 images submitted.
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>>8772661
those jobs would suck too, in different ways
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>>8772661
this is what you get for being an immature troglodyte who doesn't understand that accumulating money and having financial stability is the main goal in life

>inb4 philosophical bullshit about soul, dignity, happiness, etc
having enough money lets you live life the way you want it, that's all the information you need to know in order to conclude that money is the primary goal
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>>8772690
>having enough money lets you live life the way you want it
oh anon, that's not how it works

signs that someone is a brainlet
ENGINEERING EDITION

>Celsius is better than fahrenheit
>metric system is sooooooo much better than imperial
>fluid? you mean a liquid?
>time is infinite so that means that every possibility will occur and everything that is happening now will happen again
>you can see steam
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>>8772564
Why don't you come back when you've calmed down?
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>they're an engineer
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>>8772564
Kelvin master race

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This animation hints at the complexity that emerges when points in 4D are linked together to create basic four-dimensional objects. The object shown here is the 4D equivalent of a cube, known as a tesseract. To create this animation, the tesseract was rotated in four dimensions, then projected into three dimensions.
15 posts and 5 images submitted.
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>>8772397
>the meme dimension.

You have to understand we can't and we will never can see 4+ dimensions in our reality.
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>>8772397
If someone said the universe were 4D, would that mean that it wraps around itself, and you could go in one direction and end up where you started? If you follow a specific point on that gif you get a loop.
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I thought it was just a 3D projection of a 4D object, not the 4d object itself. The same way a series of squares would be a 2D projection of a 3D cube

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I have a theory that I'd like to run by /sci/: That dark matter does not exist. Rather, the universe is comprised fully of normal matter. Not matter that is "in our universe", yet still affecting "our universe" gravitationally.

We know that our normal matter comprises about 5% of the matter in the universe. What if the initial singularity that contained all the matter in "our universe" only contained 5% of the matter in the entire universe? Kind of like how a black hole exists in our universe as a singularity with a lot of matter around it. We don't know what would happen in a singularity that size, so is it sane to assume that maybe a singularity with the amount of energy as our universe would go bang? Well, we know it did at some point, right?

The other 95% of the universe not in the singularity would be pushed away from the Big Bang, perhaps allowing a sort of closed system for the "new"(our) matter. At some point, though, the gravitational pull of the 95% would start to pull towards the rest of the universe, which we know is homogenous, so everything would be seeming to move "away" from everything else as it is pulled to the surrounding universe.

This could explain the change in phase to accelerated expansion of the universe. Now I have to ask a question: Is there a "terminal velocity" for gravitational pull that perhaps the matter of "our universe" has not reached yet in relation to the surrounding universe?

Is this batshit crazy? I know that all our equations are based on the idea that all energy was inside the initial singularity.

https://en.wikipedia.org/wiki/Dark_flow
This is the idea that there is something "beyond our universe" pulling it.

There are a million implications if this is a reasonable theory.
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>>8772308
>assuming the universe is homogenous
please don't do this
>>
It could explain the multiverse theory --that out there there are more "universes" in the greater universe. In this model, there would be no "end" of the universe, at least in the ways that we have imagined. There would be a great reconciliation of our mattter with the matter of the greater universe. Big Bangs would be a way to recycle old matter and create new elements, etc. It would imply that "time" did not begin at the Big Bang, and that the physical laws of the Big Bang are not unique, that classical and quantum physics are compatible with the greater universe, which must be made up of the same stuff. A Big Bang might even be "caused" by a greater being from another, older Big Bang universe.
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>>8772308
>Not matter that is "in our universe", yet still affecting "our universe" gravitationally.

Okay so you're taking a simple hypothesis and replacing it with two pretty extraordinary hypotheses? Not generally how it works, but alright.

>The other 95% of the universe not in the singularity would be pushed away from the Big Bang
Pushed where?

> so everything would be seeming to move "away" from everything else as it is pulled to the surrounding universe.

But why would that acceleration be accelerating? Unless you want to argue that it's because everything is getting closer to the rest of the matter, sort of like falling down a potential well. Which implies a notion of distance, which implies that the material is actually within our universe just (perhaps) outside our light horizon.

>This is the idea that there is something "beyond our universe" pulling it.

As far as I'm aware that's not a particularly well accepted idea. Since the only Mersini-Houghton could think of testing it was by looking for some particular kind of anisotropy in the CMB, AFAIK that search was "inconclusive".

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>tfw the number of terrorist attacks by country follows Zipf's law

what the fuck is this dark magic /sci/?
16 posts and 2 images submitted.
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>>8772291
Source
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>>8772296
[1]https://en.wikipedia.org/wiki/Number_of_terrorist_incidents_by_country
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>>8772291
>Something follows a particular distribution

It's no more magical than height following a Gaussian.

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How should a brainlet with no prior CS skills enter into computer science? i.e. what should I introduce myself to first and any additional steps or guidance to get the ball rolling?
16 posts and 2 images submitted.
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I'm a CS dilettante myself so I can't really give good advice except that the programming general on /g/ would probably give better advice than here which is mostly concentrated on the 'hard' sciences.
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>>8772136
SICP
Learn You
Real World
Graduate Texts from Springer
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>>8772136
google "hello world in basic" then once you figure out how to do that you're ready to move on to machine learning

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Let's have a neuroscience general. I'll be around to answer questions for a little bit. All questions are welcome, though my expertise is somewhat limited to cognitive neuroscience.
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I am trying to do a project in my Earth Science involving Cryptozoology, but the topic of the project must be entirely scientific.I can't simply say "do cryptids exist?" any advice?
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>Cryptozoology is a pseudoscience that aims to prove the existence of entities from the folklore record
>topic of the project must be entirely scientific
Maybe make it about mental issues of the people making the shit up.
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>>8771973
Professor project could pertain to Cryptids i'd just need a solid topic to work with. So far the psychological angle seems good.
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>>8771961
Pick a new topic?

Or illustrate how zoology, and science, can respond to "cryptids" like the gorilla or okapi, which turned out to exist, and sasquatches and Nessie, which turned out to not exist. Thus illustrating the value of science.

>mfw you cannot possibly prove 5 is a real number (it's not)
17 posts and 2 images submitted.
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do your own homework brainlet
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>>8771757
proof by contradiction. Suppose 5 is not real. Then sqrt(5) could not be real either. But sqrt(5) is real. Therefore 5 is real.
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>>8771774
Lol what. How does sqrt have to be real?

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If CS is so easy why didn't you solve this yet you bloody brainlet math majors?
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If Math is so easy why didn't you solve the Riemann Hypothesis yet you bloody brainlets?
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>tfw P = NP is to easy to solve
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>>8771729
i did, it's trivial

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Is there a math formula which rounds down(floors) a number by simply using the number itself and basic math? By example: f(1,5)=1. Can we floor the number by only using the number itself and not picking out its decimal?
24 posts and 1 images submitted.
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>>8771694
Yes, floor(x) is a simple fiction using basic math and only x
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>>8771694
ceiling(x-1)

:^)
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>>8771699
Using * / + - ^ etc. how would one do that?

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