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Archived threads in /sci/ - Science & Math - 229. page
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File: solar.jpg (106 KB, 720x480) Image search: [iqdb] [SauceNao] [Google]
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Will solar energy save us?
251 replies and 18 images submitted. Click here to view.
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>>8194879
It already did. The Earth would be a dead snowball without solar energy input.
>>
>>8194879
No.
https://bravenewclimate.com/2014/08/22/catch-22-of-energy-storage/
>>
>>8194928
Just save up water in hydro plants during daytime and price fluctuations will naturally encourage consumers and industries to use power when the sun shines.

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/sci/, this is frustrating me. Help me out.

Let's say I travel 10 miles at 20 mph - that takes 0.5 hrs.

Now let's say I travel half the distance at 15 mph and the other half at 25 mph. That comes out at 0.5333 hrs.

My question is, why don't they both take 0.5 hrs. Why doesn't travelling 5 mph faster the last half of the distance make up for travelling 5 mph slower the first half of the distance?
17 replies and 2 images submitted. Click here to view.
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You're looking at average speed over distance, while you should be looking at average speed over time. The average speed over distance is indeed 20mph (you travel equal distances 15 and 25 mph), but the average speed over time is lower.

The reason it's lower is because you spend less time traveling 25 mph, since it takes less time to cover the 5 miles. So the last half where you're travelling faster can't make up for the first half where you're travelling slower. Lower average speed means a longer travel time, hence the 0.5333 hrs you came up with.
>>
The distance travelled is equal to the average velocity (over the entire trip), multiplied by the time. Since it takes longer to travel 5 miles at 15 mph, the average velocity of the trip is less than 20 mph
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>>8203859
ninja'd

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I don't know a shit about physics, but i have a question:
If somebody "thinks" (processes information) in higher speed than normal person, will this dude see everything in slow motion?
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Why dude? We have 2 species on this planet co-existing at very different speeds. Women, being unable to evolve quickly are living a life twice as fast as men up to around age 40.
Men have slowed down, mature much much later and last well into their 90's.

Ask a 'chick'
>>
>>8203640
Unverifiable

How would you determine whether one person's second was faster than another person's second? They'd both just say it takes a second.
>>
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>>8203654
Damn, i didn't consider that.
Since you're born with it you couldn't be aware.
Buuut.. Couldn't exist a a way to verify it, i mean what if you make a comparison between 2 persons?
I know that both persons will see the same second in the clock, but couldn't you measure their reactions or something like that.
Of course i'm hypothetically talking about somebody that has a noticeable difference in his thinking speed in respect to a regular human.

Is homomorphism induced by covering map surjective? Does it naturally comes from surjectivity of covering map? Why is Hatcher's book not readable?
12 replies and 1 images submitted. Click here to view.
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>>8203430
Are you talking about the homomorphism of fundamental groups?
>>
>>8203506
Yes, sorry
>>
>>8203430
It's not. (the usual example of the reals and the circle).
It's injective, actually, because you can lift path homotopies. Look at the monodromy theorem.

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ITT we discuss, how important sight is for scientific advancement.
Let's propose there were a planet where no species evolved eyes, and sonar would be the main form of navigation. Also, there's a species with intelligence comparable to humans. How far could they advance technologically? Would they ever become aware of space existing?
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>>8203420

Yes.

Now, go away.
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>>8203420
>Would they ever become aware of space existing?
Would they have some form of navigation? A sonar, for example?
>>
>>8203453
You baiting? And what I ment was that sonar won't work in vacuum, so they would have no way of gathering info from outer space, so they wouldn't know about stars. They'd have no idea about universe existing

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Are games useless/time wasters(feels so to me) and if so what better thing can I do instead to relax.Its mostly because I just feel exhausted when I study even just after 1 hour and dont know how to fix it so I just end up playing games with hours.
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Depends. If used for sheer escapism, yes. If they're a proxy for self discovery, to immerse yourself in another world, or whatever, in a way that adds to the total spectrum of thoughts and ideas your mind is composed of then no.

This is really too individualized to give an absolute answer, or even lay out a rough heuristic. Depends what you want and find valuable. I haven't played any video games in a few months and feel.. better, I suppose. Only because it broke many of my routines, habits, and mental cycles. ie, I would get real high on stimulants / anxiolytics...
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>>8202983
>what better thing can I do instead to relax
Take a nap. Go for a walk. Exercise. Read a book.
>>
>>8202995
>If they're a proxy for self discovery
I manly use them to improve my communication skills(yes I know how pathetic it sounds)
>deep breaths
I do too but still can focus and just either read the same sentence over and over or want to fall asleep(usually after eating).
>20 hours
well i stay awake around 14 hours (9h sleep) since I understand how important is and I really care about it.

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Blu-Ray Disc's have more storage than Other Discs because the Laser is blue instead of Red. Because blue has a shorter wavelength than red, it can send more information in one second unlike a red laser. Using that logic, Can someone invent Gamma-Ray Inc. where they use a laser with the wavelength of a Gamma Ray (An Uranium Nucleus) and store even more info. Just wondering.

>The laser would be invisible though.
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>>8202550
>Because blue has a shorter wavelength than red, it can send more information in one second unlike a red laser
This is incorrect. Shorter wavelength means that the information can be stored more densely on the surface of the disk. The laser itself is not sending any information at all.


As to your other point, the answer is no for multiple reasons.
1. gamma radiation produced by nuclear decay is isotropic, meaning it has no preferred direction.
2. gamma and x-ray radiation...
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>>8202550
If you had a gamma ray laser, you'd make more money selling it to the military, I think.
>>
>>8202550
>>8202571

Same poster here. I would like to point out that if the atomic lattice properties of a surface could be manufactured such that it could store data consistently, soft x-ray lasers could be used to read the data. I don't see this as a viable way to store or read information though. Equipment like this is quite large and essentially useless outside a laboratory setting.

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Artificial life thread.
What's the best artificial life simulation out there /sci/?
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>>8202192
"Best" is relative; it depends on what exactly you're looking for. Every Alife sim sucks at something, and is most interesting in a particular area of focus.

Question: Are there any alife systems you know of that focus on developmental biology, where the organism's structure isn't directly determined by genetics but instead develops from a simpler structure according to a program encoded by the genome? I suspect this could be an interesting aspect to play with, as structures that arise...
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>>8202200
(HyperNEAT is related but not quite what I'm thinking of; I'd prefer something where the structure-producing process is emergent from the behavior and interactions of individual organism components.)
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>>8202192
Being on 4chan

Are you guys excited for the Juno mission? What do you think the results will be?
23 replies and 3 images submitted. Click here to view.
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we already had hi-res photos of jupiter. i dont think its gonna be a big deal at all
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>>8202035
>>8202042
We've had medium resolution pics from hubble, and a couple high resolution pics from fly-bys

juno will take countless high resolution pictures over a long period of time, studying the planet in great detail

i think this is a pretty big deal, and then there's the fact that we might finally figure out the interior of jupiter
>>
>>8202064
Well its just jupiter, nothing but gas and shit in there. I don't know how it would be beneficial.

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Someone redpill me on the fourier transform please.
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additive synthesis
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>>8201961
On compact topological groups it's a corollary of Peter-Weyl theorem. On locally compact abelian groups it's a corollary of the definition of the Pontryagin dual.
>>
>>8201996

wtf! i'm a #wildbergermissile now

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Explain why this wouldn´t work.

The ball is dropped on the red line, suppose to be some flexible material like rubber. The blue box is slightly heavier than air making it rest at the bottom. As the rubber is pressed inwards the air pressure inside the outermost box increases making the blue box lighter causing it to rise. The blue box hits the ball back up and as the rubber returns to its original state the air pressure returns to normal causing the blue box to sink to the floor.

I understand that its not practical, ie, the blue box might not rise fast enough...
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Why do you think increasing the air pressure in the big box would make the blue box rise?

I'm pretty sure increasing the air pressure would make the blue box stay right where it is

Has can't stay in the form of a "box", regardless. It will expand to fill the volume of its container, the partial pressure of the air is what keeps the blue box down near the floor
>>
>>8201940
nothing wrong with that theory where:

desnity of air = x
density of ball = x + e
density of block = x - e

lim(e->0)
>>
>>8201940
Wouldn't the increasing pressure compress the box too, making it denser?

But if not, then assuming no energy losses perhaps you could get that thing to oscillate forever. That's not what people usually have in mind when they're talking about perpetual motion devices (an idealized mass on a spring would be a perpetual motion device by that definition).

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can we agree that planets and solar systems are in some sense "alive"?

I don't mean biological beings, but beings that have subsystems that react to their enviroments, just like living beings.
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can we agree that atoms and molecules are in some sense "alive"?

I don't mean biological beings, but beings that have subsystems that react to their enviroments, just like living beings.
>>
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>>8201762
can we all agree sound vibrations and resonance and the human puzzle of creation of division and bioligy devided by sound is fact?
>>
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never got an answer for this.

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Hey /sci/,
Do you use linux at home or for work?
If so what distribution of linux do you use and why?
16 replies and 1 images submitted. Click here to view.
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Arch linux, at home and at work, mostly because I'm a member of the AV club.
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>>8201483
>AV club
arch is for cs plebs, centos if ure serious
>>
I use Arch for my personal computer and Debian for my server. If you're in the sciences, it's a good skill to have. If you're new to linux, I recommend installing Kubuntu in a virtualbox. I used to run Kubuntu on an old machine which is now dead (not because of Kubuntu) and it's pretty easy and slick. Since it's just Ubuntu with KDE, it's one of the easiest distributions to troubleshoot in my opinion.

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Imagine a hypothetical being or "zombie" that is indistinguishable from a normal human being except in that it lacks conscious experience, qualia, or sentience. When a zombie is poked with a sharp object, for example, it does not feel any pain though it behaves exactly as if it does feel pain (it may say "ouch" and recoil from the stimulus, or tell us that it is in intense pain).
It is just as capable of problem solving, working and reproducing as a normal human.

Why aren't we all zombies?
27 replies and 1 images submitted. Click here to view.
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>>8199921
>Why aren't we all zombies?
we are.
Prove me wrong, oh wait you can't.
>>>/lit/
>>
>>8199921
Have a look at solipsism. It will expand on the concept you've proposed.

Also, it's not science because you can't prove it.
>>
>>8199921
Zombies can't collapse the wave function.

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Post the funniest research papers you've encountered. Or ones that have made you sad or furious.

Meyer-Rochow VB, Gal J (2003): Pressures produced when penguins pooh—calculations on avian defaecation. Polar Biology 27:56-58.
50 replies and 6 images submitted. Click here to view.
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>>8199547
good kek thread
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>>8199547
A Mathematical Model for the Determination of Total Area Under Glucose Tolerance and Other Metabolic Curves

basically this woman reinvents high school calculus, names it after herself and gets cited like mad
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>>8199737
This story gets exaggerated more the more it is brought up. No, that is not what it is.

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Isn't infinity just a concept? Can an undefined number be bigger then a defined number?

I am a total noob when it comes to mathematics.
33 replies and 6 images submitted. Click here to view.
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>>8199101
Infinity is big, and stupid, and fat, and ugly.
>>
Infinity is a big number
for you
>>
>>8199101
Infinity doesn't exist in nature, so yeah it is a concept, just like elves, Santa, God, and good rap music.

Hey, so, I has a question. How big is the biggest neural network that wed have ever built and how does it compare to the human brain?

Also, how far can we go in terms of building a large neural network?
48 replies and 4 images submitted. Click here to view.
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>>8198908
The largest we've roughly simulated is a cluster of ~10 neurons.

A novel hardware architecture will be needed. Even the current cluster-based computing isn't good enough and has too many problems with synchronization and latency.
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>>8198914
wait, so youre telling me this one had like, 10 neurons?
http://www.popsci.com/science/article/2013-06/stanfords-artificial-neural-network-biggest-ever

Do you mean single processors only?
>>
its microsoft's res net with like 150 layers.

>also your a fucking retard OP

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Sup /sci/

I'm a senior in EE. I graduate in December. I want to get a more in depth knowledge of Calculus.

When I took Calc 1 through 4 I kind of just went through the motions. Basically, I learned a very superficial knowledge of the concepts in order to simply pass the exams. I quickly learned, however, that having an intimate knowledge of concepts like differentiation and integration. I often struggle in some of my classes to realize that something can be solved by simply integrating or differentiating due to the fact that I don't truly understand...
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If you want a more theoretic approach praising formality you should pick either baby rudin or Spivak and work your ass through them and then start with analysis
>>
super bump
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>>8198159
I'm going to start a degree in EE in September, any tips?

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Should we start reducing the human population right now, and keep a sustainable number? How?
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>>8200157

It would be nice if we could do this, but short of me becoming a living god tomorrow and gradually massaging the number downwards over generations by sustainably limiting human procreation (the best possible method since it involves conscious, singular self-direction of a species), it ain't gonna happen. The animal is programmed to breed breed breed, as animals do, until external factors limit its growth. The animal is also programmed for intra-species competition to optimal sexual access, (among access to...
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>le overpopulation maymay

Scarcity isn't caused by a lack of resources, it's caused by inefficiency in distributing the resources, you ignorant mong.

With better energy sources literally anything is possible, until we run out of surface area on earth to build structures on. That's not happening any time soon.
>>
But anon, what are you talking about? Everyone is telling me overpopulation is a myth, and that population is projected to begin to decreasing. They also say the planet can support ~14 billion...

I don't know about you, but I can't wait to watch my nice, peaceful, relatively quiet rural home, be ravaged by intense development and a massive population influx. I can't wait to be stuck in traffic all day living in a nice cement paradise with light pollution that eclipses the stars. And don't forget! The people! I can;'t wait to feel all cuddly wuddly...
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Why do intelligent people tend to be less happy?
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not enough memes
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>>8197181
What is your reasoning or source and how do you define "tend to be" and "less happy"?
>>
They realize that life has no purpose and can see past the artificial and materialistic drive of society.

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Sorry for the inane post but I could really use some clarification here...

the disputed question is number 17 and whether or not it is True, False, or "merely possible."

A fellow maths student and I are convinced regarding one answer but my book provides a different one so I'd like to hear /sci/'s take on it

formal logic applies so keep that in mind

after a few responses I'll let you know what the book said, you can all probably guess though
74 replies and 3 images submitted. Click here to view.
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>>8203755
true
april showers characterize may flowers
as in, one happens if and only if the other one does
>>
false
>>
can't you just contrapose the first statement to deduce 17 must be true?

they probably wanted you to see that 17 is only possible based on statement 2 because they're stupid

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What music does /sci/ listen to when they study or practice the maths?
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>>
The Residents t.b.h
>>
/mu/core
>>
GY!BE

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is the opposition against GMOs entirely emotional and based on some vague "ethics" ?

i dont see why we should put any restrictions to genetical engineering at all i dont even see why we should not freely apply this form of engineering to better the human genome or create human-animal hybrids

so /sci/ is there any scientific argument against at least some forms of genetical engineering
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GMO food is never modified to be more delicious or nutritious.
Instead it is modified to be pest, and pesticide resistant.
It's not about your health, it's about corprate greed.

Also tumors.
https://www.youtube.com/watch?v=U5Vl3ORH5ME
>>
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>>8190912
>>8190926
>>
>>8190955
i have deliberately asked for counterarguments

why dont you just provide me with some instead of just hypothesizing about my reactions to them ?

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What IS the Universe?

>"It's le Universe duh"
>"It's """energy""" and """matter"""
>"It's the set of all sets that are members of themselves"
>"It's """"""""EVERYTHING""""""""""

These are all filler words that describe nothing.

So...
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It's le Universe duh
>>
>>8201696
Le Universe duh. It's a set of all sets that are members of themselves, including energy and matter; basically EVERYTHING.
>>
>So if you could zoom back and see the whole Universe, what would it be and what is it doing?
A singularity

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ITT: Notations or conventions in math and science that make you REEE. Bonus points if we're too far gone to change it and just have to deal with ut at this point.

I know these things are abritrary and don't affect anything drastically, and I know this is a brainlet tier shitpost, but I'm interested in seeing what you all think of this.

> The charge of an electron being denoted as negative, leading to "positive charge flow" in circuits and other retardation.

> The use of π rather...
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same
>>
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>>8186085

Oh, and the use of "It can be clearly seen" or "It is fairly obvious" in any textbook ever. It's the laziest cop out WRYYYYYY
>>
>>8186085
>REEE
gb2/r9k/ you fucking autistic cancer.

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Is 25 too old to start leaning math?
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How much math are we talking?
>>
>>8202491
No, never too late.
>>
>>8202504
I only know basic calculus like derivatives and integration, so everything above that

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2016 and we still can't turn scrap metal into gold.
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Probably because you would invest a ton of money to do that and it would decrease the value of gold because you devaluated it by increasing the supply.
>>
But we can turn gold into scrap metal, which is almost as good.
>>
>>8201607
https://en.wikipedia.org/wiki/Nuclear_transmutation
> Nuclear experiments have successfully transmuted lead into gold, but the expense far exceeds any gain.

fuck off retard

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Could anyone tell me if this is the correct formula to compute the complex analytic signal (X) for a real-valued signal (s) using the Hilbert transform?

P.V. indicates that the integral is taken in the sense of the Cauchy principal value.
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Here are some SFW tits in anticipation of a response.
>>
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please respond
>>
Post better tiddies and ill help you

Summerfag here. Does love transcend space and time or is it just memories and hormones?
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it's a form of vibration. so I think it transcends space and time.
>>
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>>8201240
Love transcends everything.

Look into your heart.
>>
>>8201306
Vibration of what? Love aether? Or particles/waves of love flying through spacetime? Come on, we are not living in teenage sci-fi romance What is horniness then? And other emotions? Why is love so special that it should have these properties?
Love is explainable as the right mix of hormones and neural constellations in your brain, why build such an obscure theory?

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>psychology is a science
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Define Science.
>>
>>8201198
Why are you people so obsessed with shitting on other fields?
>>
>>8201199
>Define Science.

repeatable experiments


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