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Archived threads in /sci/ - Science & Math - 1756. page

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Is there a scientific reason why do so many men have chin scars?

Pic related, I couldn't help but notice, that a lot, and I mean a LOT of men have chin scars. Me, my best friend, cousin, also a few classmates etc.
What gives?
14 posts and 1 images submitted.
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People fall on their chins.
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>>7994364
I can vouch for this
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>>7994364
Really? that's it?

Tbqh, I can't remember how I got mine.

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Well?
16 posts and 1 images submitted.
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>>7994329
A and 7.
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Am I getting memed ?
>>
>>7994329
A and 2

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>atypically cold day
>lol see anon, global warming isn't real, liberals are so goddamn stupid
38 posts and 7 images submitted.
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>>7994107
Every single time. And then when you say climate change instead, they go on about how the government and scientists are conspiring against America
>>
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>>7994107
>snows in the winter
>winter, on average is warmer than usual.
>lol dude are you retarded climate change isn't happening. It still gets cold in the winter. You see it's really the government trying to get over on the job creators so that China can get ahead
>also here's that climate gate source which proves scientists are really making it up
>none of your sources matter either
>>
>>7994107
I really don't think this is a conversation that happened. If it is, please reevaluate who you choose to spend time with.

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Help I'm in need of a wake up call.
1. How do I become smarter.. Do I just read more? Study more? Is it a natural talent? I'm your average "highschool was cake, college is harder now I get Cs and Bs"
2. I'm studying Chem Eng and its interesting but I'm having a horrible time trying to get an internship or coop
3. ILL NEVER GET A JOB AND DIE ALONE
4. I smoke everyday. Not out of necessity or even because I like to I'm just so goddamn bored without it
5. What can I do
23 posts and 1 images submitted.
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where
>>
Penn state, USA I'm ending my 6th semester as an undergrad
>>
>>7993998
Read, practice, experiment. Reduce the time you spend on unproductive tasks (like whining on 4chan).

Eat healthy, lose weight, and stop smoking.

Be happy about what you're studying and stop thinking about life success in terms of wealth acquisition.

Let someone who can help you know about your predicament and give you advice.

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What sounds like a good bachelor's thesis title?

Nature-inspired algorithms
Approximation algorithms for TSP

Or something else related to optimization or AI, which is what interests me mainly.

Graph theory, combinatorics or distributed computing is nice too.

Also, /csg/
13 posts and 2 images submitted.
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I literally cannot comprehend how someone in their final undergrad year would go on an imageboard to ask a bunch of neckbeards what to write his fucking thesis on.

Just how autistic are you? Go talk to your fucking professors.
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>>7993725
Just interested in some ideas that I may not have thought about
>>
"A Polynomial Time Solution to the TSP Problem"

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I was watching a video where they made a joke that implied that in american universities you have 800 people lectures. Like, actually 800 students in one classroom being taught by one professor.

Is this actually true? In my university we have 20 people classrooms and classes get pretty personal. Furthermore, the big 100 or 200 people rooms are used only to give talks about events.

However, that may be because I am studying pure math and we are actually a really small group. However, I've heard from other professors that the biggest faculty (business administration) has like 60 people classrooms at max.

Is this the reason that americans are getting dumber and dumber and ranking lower in science year after year? That in their universities, they are one head out of 500?

Have any of you ever been addressed by a professor in class?
63 posts and 6 images submitted.
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>>7993663
And each one of those 500 kids is paying $20,000 a year and they probably have 20 more lecture theatres on that campus. You can see why the Jews tell kids to go to college.
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>>7993675
This is what doesn't make sense.

They are paying like 50k per semester to learn Calculus I and the only benefit this could have is that they can ask questions to their professors, something they couldn't do if they self studied.

But how do you even ask? I mean, take a look at the picture in OP and tell me how the fuck do you ask a question when you are the guy sitting at the back?

You don't get a single benefit by going to such a class.

Also, with so many morons around you, that looks like a really bad learning environment.
>>
>>7993687
That's not a calc class. More likely, that's an orientation seminar, or some kind of meeting of student government members or something.

We do have lecture classes that can get to like 100 students at some universities, but those are the most basic "intro to computers" classes.

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Trying to understand hypothesis testing in psychology, but I can't work out what tests to use for my hypotheses.

One example hypothesis is comparing three Independent variables with one dependent variable.

> low social support (satisfaction and number), low adaptive coping (seeking social support, stoicism, and self-care), and high perceived stress would be associated with high depressive symptomatology.

I think you would separate each IV and compare them individually with the DV.
>IV1xDV
>IV2xDV
>IV3xDV

So I was thinking a t test or maybe an ANOVA.

The second hypothesis is comparing a nominal variable with two dependent variables (i think?).

> rural participants will have lower perceived stress and depressive symptomatology levels than their urban counterparts.

I was thinking chi squares and an ANOVA?

I've looked through my books but it doesn't tell me what tests I need to perform, just that it requires pearson's r and stuff like that.

General SPSS thread.
13 posts and 1 images submitted.
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>>7993516
anova is for testing groupd differences, you want linear regression
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>>7993536
oh okay thanks
>>
>>7993516
What hypothesis test are you using? There's plenty, but I know you psychologists only use the most basic babby statistics

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>Even if aliens existed, they would think of us as we think of ants

Humans think of ants as insignificant because for the most part they're almost invisible to the naked eye due to their size.

Many people, myself included, are fascinated by ants.

Why the fuck is this comparison always made when people bring up aliens? I find it improbably that a space-faring civilization would be so large that human beings would be of comparable size as ants are to us. Plus I'm sure there'd be a couple ayylmaos that would be curious enough to at least acknowledge us.
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>>7992822
There are humans who take interest in apes right ?
So there definitely are aliens that would take interest in us
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>>7992822
>>
Try reading Roadside picnic

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Could someone here who is good at logic explain to me why the conditional (->) is true in the case where both the antecedent and the consequent are false? It makes no intuitive sense to me, and it seems to even translate pretty badly to English. Consider the following proposition:

[math]P \to (P \wedge \neg P))[/math]

This is false when P is true, and true when P is false. Let's use say "I am alive", as P. So let's say P is true. Then:

"It is the case that if I'm alive then I am both alive and not alive."; obviously false.

But let's see the same case where P is false, e.g. "It is the case that if I'm not alive then I am not alive and I'm alive."; somehow true.

Anyone have any sort of explanation?
12 posts and 2 images submitted.
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>>7992820
if
2<1
-> 4<2

axiom wrong but logic correct
>>
>>7992820
One interpretation is that it is not the case you're not alive, so it doesn't matter what the consequent is; the statement is still valid.

However, it's best to think of -> as a formal symbol that doesn't correspond exactly to our every day english usage of "if x then y" or "implies". It's just a mathematical symbol that is defined a certain way. The confusion comes from logic classes in philosophy departments that try to link it to natural language interpretations.

You can read more about this here:
https://en.wikipedia.org/wiki/Material_conditional#Philosophical_problems_with_material_conditional
>>
>>7992820
Well, what you're doing is treating the truth value of the term in the parentheses as stemming from the semantical interpretation of its constituent letters. this is your problem.
What you have to do is consider the rules for conditionals,
T->T = T
T->F = F
F->F = T
F->T = T

For conjunctions

F^T = F
F^F= F
T^F = F
T^T = F

When considering P->(P ^ –P), treat the term in the parentheses as one letter, for example q. Treat P as P. This yields
P->Q

Then you just evaluate it as if this is your sentence. The reason your sentence is true when P is false is because a conditinal that is false->false is true, because it is always true to say "If P is false, then P is false".

does this explanation make sense?

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What is /sci/'s opinion on this theory? Surely im susceptible to scrutiny on this board for asking because its nots strongly supported by scientific evidence but I am genuinely curious about how you guys feel about this idea?
13 posts and 3 images submitted.
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>>7992789
Not a theory. Not science. Don't post this shit here.
>>
Would be pretty cool if it were true.
>>
>in societies which allow orgy men cannot trace lines of male paternity, men cannot trace lines of male paternity. What does this mean? It means that men do not identify with children as property. It means that the men of that kind of a social group can only think in terms of our children, we the group, our children. And it creates an immensely cohesive social glue that I believe held these societies together for millennia.

DUDE WEED LMAO

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I've heard of stuff like "three body problems", but what do they mean for physics engines?
Is the situation that if I have two interacting bodies I can input a time parameter to find out where they'll be at any moment, but I have to run a stepped simulation as soon as I add a third body?

If that's the case, anyone mind explaining how the three body problem arises? I'm interested in seeing if there's ways to sacrifice simulation accuracy to treat large systems as a tree of two-body systems.
34 posts and 4 images submitted.
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>>7992777
Trips not enough for an answer?
QUADS
>>
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>>7992777
I know it's a scifi book but it does a good job of explaining the three body problem in layman terms. Basically it's impossible to predict the outcome of a three body problem unless you know the starting states of all three bodies.
>>
>>7993333
>>7992777
Well then

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Hey /sci/, first post here. I'm writing a movie, and the "villain" in my film wants to kill every human on earth because he thinks he would be saving the world and doing the galaxy a favor before humans begin to spread like a disease.

What is the most effective way to eliminate the entire human population from a scientific standpoint? I'm thinking a disease or nukes could work, but I'm not sure if that would get everybody. Destroying earth's magnetic field maybe?
39 posts and 2 images submitted.
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>>7992588
Let him break the fourth wall and kill you. Since you're dead now, your imagination doesn't exist, therefore everyone in your movie dies.
>>
>>7992588
Without commenting on the originality of the villain, the most efficient way to make humans go extinct, which is an extremely difficult task by the way, would be some kind of genetically engineered airborne disease. Work with that.
>>
>>7992588
He sits in an air-tight chamber with a giant pump sucking all the air that we breathe out of the atmosphere. It's then condensed into liquid form and set alight and the bi product sent back out into the atmosphere. Eventually there will be no air left and because his "lair" is in the middle of some remote jungle no one would know the source.

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Scientists have added a one-atom thick layer of graphene to solar panels, which enables them to generate electricity from raindrops. What does /sci/ think of this?

http://sciencenewsjournal.com/future-solar-panels-will-generate-energy-raindrops/
30 posts and 3 images submitted.
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Not clicking, have an (OP) though.
>>7992172
>>
When we are able to synthesize enough graphene to put in every solar panel, most problems we have today will already be solved.
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>>7992172
I saw that it's about 6% efficient in its process. This means 6% of the energy of a raindrop interacting with the graphene layer. Basically barely any energy at all in terms of practical use, but it's cool I guess

fuck this
27 posts and 6 images submitted.
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>People claiming their own Darwin Awards left and right
>>
It's actually proven that regular cannabis smokers are much less potent for developing cancer cells in their body. Source : snoop dogg
>>
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>>7992128

Proven status: Proved.

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What does /sci/ think about graph theory and combinatorics?
35 posts and 3 images submitted.
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I hope to make it my field of study if I stay in academia
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>>7992024
I think that is a kickass textbook.
>>
Counting seems pretty hard and doesn't seem very useful once you get beyond the basics. Similar thoughts about graph theory desu.

I used to like these topics and other "discrete" math topics when I was undergrad, but now I see that differential geometry is way more interesting and useful.

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