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Archived threads in /sci/ - Science & Math - 246. page
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He's trolling, right?

https://www.youtube.com/watch?v=REeaT2mWj6Y
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>>8165779
He's always trolling.

Master ruseman.
>>
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>>8165779
No
>>
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>>8165779

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http://www.thphys.uni-heidelberg.de/~weigand/Skript-strings11-12/Strings.pdf
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http://www.math.harvard.edu/~shlomo/docs/Advanced_Calculus.pdf
>>
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>pedophile cartoons
>back to /a/
>>
[math]\displaystyle{\frac{e^{-\frac{(x-\mu )^2}{2 \sigma ^2}}}{\sqrt{2 \pi } \sigma }}[/math]

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whats /sci/'s opinion on this guy?
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>>8163569
these threads work better when you start with giving your own opinion
>>
>>8163573

well I wanted to ease into it since anytime you make threads like this on /sci/ its usually flamed for being /x/ bullshit but I am legitimately curious what some of you thought. If you look into his stuff and listen to what he has to say obviously its very speculative but I don't really see how its that far fetched and why someone would go to such measures just to tell fallacies about working on extraterrestrial technology
>>
>>8163569
After all of his interviews that I have listened to, I could never help thinking '"this guy does not sound like an engineer, a physicist or any other kind of scientifically trained professional."

Just his language, grammar and vocabulary, he doesn't sound like a highly technical advanced scientist at all. always thought he just sounded like some average blue collar schmuck reciting some ideas he gathered together from reading alot of science fiction and binge watching the Discovery Science channel.

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The theory of life starting on earth by lightening striking a tidepool or puddle is the most retarded thing that has ever been accepted as truth in all of recorded history.

Flat out.

Retarded.

I have more respect for flat earthers than puddle people.
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>>8173679
>Retarded.
not that it matters to anyone... but why?
Do you have a better theory? Can you give reasons for why the theory should not be true? (I havent even heard of it, btw)
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>>8173682
Because it has never been proven but is still lofted up like a goddamn golden bull for all to follow.

Abiogenesis is hailed as the one thing to follow when it comes to the origin of life as if the world of science is a goddamn religion. Usually when you say "uh, lightening hitting a puddle didn't start life on this planet. I don't know what did but it sure as hell wasn't that" /sci/fags tend to get a little pissy and start calling you a christfag and whatnot.
>>
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>>8173679
Iguanodon is my favourite hervivore dinosaur.

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Are there any actual creationists or ID proponents here?
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>>8172795
No, you're looking for >>>/lit/ if you want to talk about fantasy books.
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>>8172801
At least come up with your own fucking jokes
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>>8172795
>Are there any actual creationists or ID proponents here?

That regularly post here? I doubt it. Creationism is wholly incompatible with having any kind of desire to actually understand how nature works.

A 'creationist' will pop up in this thread, but they're probably just trying to bait people.

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The attitude that 'LaTeX is easy' is perpetrated loudly by people that haven't had to use LaTeX very much. It is only tentatively saved by the comprehensive (sometimes, if you're lucky, even readable) documentation of all its quirks. Left to over 30 years of growth outside of its intended use case, LaTeX proper does nothing you would need it to, and the packages that you use with it are horribly fragmented. Maybe Latex is good at the things it sets out to implement, but those things aren't what I or anyone else uses it for (creating publication-quality documents). So in considering latex we are forced to also consider the environment of libraries in which it exists.

LaTeX brings all the problems you had in the Windows 2000 era of programming into document creation.
> misleading compiler messages
> dependency hell
> choosing a compiler
> bad environment
> inconsistent syntax
> GOTOs
> knowing whether or not you have run the compiler enough times to produce a document (!!!)
> semantic code is impossible

Every time I want to do anything other than add words to my document, I have to think about whether I want to use Latex's meager facilities, facilities that I had to code, or facilities that someone else invented, then worry about all the quirks in them. If I want to add a table to my document, I need to decide whether it should be:
> tabular
> tabular*
> tabularx
> longtable
> align
> array
> eqnarray
> matrix
Someone told me that one of these is very bad and should be avoided unless absolutely necessary, although he didn't tell me why, and I don't remember which one.

It baffles me that thinking about these things is prerequisite to writing a document.

I am not going to stop using Latex, but no one will ever get me to say that it's easy.
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>>8171013
> choosing a compiler
does anyone use anything beside MikTeX?
> bad environment
you shut your whore mouth
> inconsistent syntax
really? I haven't noticed it in my years of using it
> GOTOs
ur doing it wrong

I only use tabular (inside a table environment making it a float)
aligh and eqnarray are for equations...and they are ever so slightly different
I used some longtable package, but ikr when.
The rest sound like junk unless you convince me otherwise

Floats are gross, but by their nature they kinda have to be.
>>
>>8171013
Honestly, if you really run into all these problems frequently, you seem to have some misconceptions on how to use latex.
>>
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>>8171035

> does anyone use anything beside MikTeX?
Yes, there is also TeXlive and others, but that's not what I'm complaining about.
Should I use pdflatex, pdftex, xelatex, xetex, or lualatex then dvi2pdf or ....???
My code previously compiled using pdflatex, but now I need some of the features that only the xetex family has. but it wont compile under xe* compilers. Why not? I don't know.

> bad environment
Recently in my lab we...
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It's all here in this NASA paper:

http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19800010907.pdf

To summarize it's a paper about field propulsion, some kind of warp-drive using lasers and magnets, nothing tinfoil here, we all know that it's allowed by Einstein's equations and that NASA Eagleworks has been openly working on these things for years.

Here's where it gets weird: Right off the bat they start mentioning UFOs claiming to "not be involved in UFO research". Why mention UFOs? it's just a physics paper....
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>>8169458
>ASTRACT
more like ass tract

this "paper" is full of nonsense, what the fuck is this?
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>>8169458
Flying wing research has been done as early as 1935 and this is with proof and documented by the Germans,stuff could have been work in progress much earlier.
Someone taking on theoretical research on different types of propulsion is nothing new.
If you thing there are really UFOs than you should get your head examined.
Seriously.
>>
>>8169458
>we all know that it's allowed by Einstein's equations

It isn't, actually; reading through that paper, it's relying on speculative physics that have not been borne out in the last 38 years of physics research. Nobody has developed a working theory unifying electromagnetic fields and gravitational fields that has achieved acceptance. (Kaluza-Klein theory was promising for a while, but no evidence has been found for it and, like other GUT attempts, tends to predict...
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Why is it not allowed to be a fucking speculative on this board?

>post or theorize about ANYTHING which isn't well documented
>your entire thread is spammed with people who fell for the college spook and only know how to parrot what their textbooks say

The fuck?
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prolly cuz ur not basing ur speculations on anything solid or testable. topics like those, everyone feels like they can throw opinions out there
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>>8169770
>Why is it not allowed to be a fucking speculative on this board?

Because 100% of the time it "speculate" and "theorise" are just euphemisms for "here's some unsubstantiated crap I thought of while sitting on the shitter". No one does anything other than present some (often) poorly thought out idea, never do people attempt to write down some mathematics and show some implications of their idea.
>>
You know who does a good job theorizing and speculating? People with some knowledge of the subject and it's history.

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Alright anons, so right now there aren't a lot of good boards on /sci/. There's a good couple, but other than that this whole place is just nope. I've come to fix that.
As of late, something has been on my mind, but I haven't been able to put it into words. Perhaps until now. I'm just going to cut to the chase.

The reverse butterfly affect.

Let's take a look at the butterfly effect. We observe a butterfly in Beijing. Every time it's wings flap, what the weather will be in New York changes. And, this may be true. It's the strangest phenomena, known as the butterfly affect in chaos theory. The absolute smallest differences can throw an entire operation off or change the affect of an event, making the outcome different from another identical event. Chaos theory is a field of physics which focuses on nonlinear equations and probability, and it's this field that applies to things like guessing the weather. Most physical phenomena are measurable and predictable, however not all phenomena can be linearly guessed. Chaos theory not only focused on observing unstable phenomena, but also in predicting the future. Where would a double suspended pendulum be if we dropped it from a certain angle? We can't really know as inputs need to be filled out.
Now, the normal butterfly affect and chaos theory focus on predicting the future.
What I'm thinking of focuses on reading the past.

Let's observe the Big Bang theory. We all know what it is, so I won't go in depth explaining it. However, when we look at how one would go about developing it, you basically just look at the patterns of stellar and galactic movement and reverse it. When we do this, all we can understand is that everything was once wrapped up really tight in a ball.
[Pretyped, way over character limit, will continue.]
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>>8173439 cont.
However, the difference between studying the Big Bang hypothesis and my idea for the reverse butterfly affect focuses on nonlinear equations. The reason we can't really formulate the nonlinear equations in chaos theory mathematics is because there are open inputs that still need to be filled. However that's just about predicting the future. There's no need to (mathematically) predict the past, as it's already happened. This would mean that the inputs for said nonlinear equations would already...
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You don't understand non-linear equations, you don't understand Chaos theory and surely you don't understand how mathematics work. Your idea is laughable to say the least. Delete this post, you're making a fool of yourself.
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>>8173471
Fuck you too anon.
Can you at least nitpick instead of just give up? I'm looking for input here. I'm not the average faggot who'll just shut out constructive criticism. I'm looking for exactly why the whole concept sucks and deserves removal from these boards, as you put it.

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Never mind faster than light travel.

Is it possible for us to travel at light speed? Half light speed, a quarter of light speed?
That's all we'd really need to explore the nearest stars.
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No, maybe and yes.
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>>8172999
No, yes, and yes.
>>
>>8173006
>>8173010
This discussion is getting a bit heavy for me

I'm a chemist and my cousin, younger than me by 12 years, has asked me for a semestral project they could do. For the love of me, I've been doing post-grad work for the past six years that I can't recommend stuff she could do anymore. I don't want to disappoint so I'm asking for ideas for projects.

They will be in a group of 4 iirc. The project can run for about 2-3 months. They have access to a chemical laboratory.

To give an idea of the level of research they can do, they extracted from leaves last year and tested that for anti-bacterial properties.
12 replies and 1 images submitted. Click here to view.
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>>8172966
This is a short project idea but what about the separation of acetic acid from pyro oil/biocrude? (via extraction and/or distillaiton)

They could use some kind of oil (vegetable or other kitchen oil) to simulate the pyro oil and just add vinegar to it.

For example, they can add water and separate aq phase from the organic phase. Then they measure the amount of acetic acid extracted by the pH. (they could obtain the pH by titration or a calibrated pH probe)

They could check the effects of T, P, acetic acid concentration, or something on the fraction of separation.
>>
>>8172966
Extraction of volatile compounds (like limonene) from fruits
Extraction and identification of lipids, using TLC
Synthesis of aspirin
Coating metal with gold/silver/copper through electrolysis
Extraction of DNA/RNA
Reaction kinetics
>>
Don't.
Labs are dangerous and high schoolers are braindead idiots.
Not to mention you won't learn abything useful in the lab if you don't know anyhing.

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Dont know why the mods decided to "DELET THIS" thread. I serriously just wanted to know how to cut out this contour.

Someone last thread said
>lofted surface made into solid.

What the hell is he trying to portray?
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>>8172794
>Dont know why the mods decided to "DELET THIS" thread.
Because this is a >>>/g/ thread.
>>
>>8172794
Learn to screenshot
>>
>>8172818
In the end it doesn't even matterrrrr

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Fug me /sci/, I ended up missing a class in the physical science section of my major. I'm not particularly interested in any of these, but I hope you guys can steer me into the most useful/interesting one for a dude who loves comp sci & math.

My options are:

Environmental Science:
Relationship of living organisms to the environment, including human impact on the atmosphere, hydrosphere, lithosphere and biosphere. Emphasis is placed on understanding of biological and physical science issues currently faced by society.

GEOGRAPHY:
Introduction...
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> click /sci/
> teleport to /a/
how did this happen...
>>
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>>8172408
I guess a lot of people on here like anime girls.

[spoiler]I can be your anime girl 2night[/spoiler]
>>
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>>8172400

geography. it is the easiest subject from the three choices. don't bother with side classes (or how do you call that? minor?), pick the easiest subjects there desu~

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>been contemplating the idea of free will for weeks
>think I may have finally found something which will get me motivated
>studying science will the the key to freeing me from mediocrity and the mundane
>realize I know jack shit about science and it's probably a waste of effort
>dreams once again reduced to nothing
28 replies and 2 images submitted. Click here to view.
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>>8172384
spoiler: free will doesn't exist
>>
Shut up.
>>
>>8172391
Yeah I know, I think that we're all basically biological computers.

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Hello guys.
Does anybody knows some online IQ tests which are relevant and closest to those which MENSA use. I want to try some of them before actual application. Thx
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reroll
>>
anyone
>>
also roll

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Ok, I have tried to understand cell complexes from Hatcher's book.

I have no problem to understand how this torus is made as quotient space, but...

he says to imagine interior of polygon on the picture as open disk ( I assume in R^2) which is attached to union of two circles ( with one point in common? ).

So, is basically 1-cell a line, 2-cell a disk in R^2 and n-cell open disk in R^n?
Do I simply take wedge of two circles and put disk around them, put it in oven and it suddenly gains height?
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>>8172148
The beauty of CW complexes is in the attaching maps. So, you look at how the boundary of the disk (so, a 1-sphere) is attached to the wedge of circles. What map S^1 —> (S^1 V S^1) produces a torus when you fill in the boundary you just mapped onto the 1-skeleton?
>>
Hatcher is a shit tier book.
>>
>>8172179

so there is a single point on the boundary of disk which is common point for two circles? Feels like I need to turn disk inside out.

What's the likelihood of the new mini ice age people are talking about?

I mean, we were worried about the exact opposite five years ago, so forgive me if I take climate science with an ocean of salt.
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>>8172130
It's a cycle of media propaganda.

They said the same thing in the 70s starting with warming and concluding cooling. Neither happened
>>
>>8172130
climate science isn't a science.
>>
>>8172135
Could you be slightly more informative than a fortune cookie, pls?

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How do you deal with people who use magical thinking instead of developing a probably explanation for every single fucking thing they say? How do people like Bill Nye and Sam Harris and Lawrence Krauss and Christopher Hitchens and Morgan Freedman and Carl Sagan and Neil Degrass Tyson and whoever have so much patience for these people? I don't, I just can't fucking stand them and I want to fucking strangle them because they're so annoying, in fact I lament the fact that I live in a society that doesn't base what it thinks on logic and probability, or just...
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Le simple thought is easier
>>
>>8171976

>talks about logic and probability
>P(OP is a brainlet)=1.0
>>
>>8171986
You know what I mean by probability. I'm not a scientist, but you can only give the best possible answer based on what you already know, and you accept that it may not be true if you don't have enough evidence to confirm it. Although when there's a blind spot in a lot of people's understandings, they just fill in the blanks with some other explanation, like consciousness for example. They like to say that consciousness exists outside of this world. WHAT!?!?? NO!!! That's the most retarded thing...
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Is Newtonian physics a meme?
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>>8171866
Do you know what a meme is?
>>
>>8171876
>Not understanding 4chan cultural diction
Fuck off to >>>/s4s/
>>
>>8171883
> not knowing "meme" is a science term
>>>/b/

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In the two-slit experiment, one particle is said to pass through both slots, to form the interference pattern. But each particle leaves a point-like mark on the screen, doesn't it? And the interference pattern is formed with time. Wouldn't it be more logical to suggest, that the interference pattern is formed due to some wave-like properties of time? So each particle passes through one slot, but we do not know which one.
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>>8171733
>So each particle passes through one slot, but we do not know which one.
that's exactly what happens.
I don't know why you thought otherwise in the first place.

One photon doesn't create an interference pattern.
10 photons don't create an interference pattern.
you need a lot more.
But the probability of each single photon of being at a certain position on the screen follows the pattern.
>>
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> falling for the double slut meme
> current year
I mean COME ON !
>>
>>8171742
>that's exactly what happens.
Not really. Take a look at the path integral formulation of quantum mechanics and see what Feynman and HIbbs says on the double slit experiment.

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Are there any major results provable with the Axiom of Choice that aren't provable with the Axiom of Countable Choice?
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>>8171727
bamp for interest
>>
Ramsey theory
>>
https://en.wikipedia.org/wiki/Axiom_of_countable_choice

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Is economics even a science? Are they lesser creatures compared to us physics and engineering majors?
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>>8171625
As someone who majored in math and Econ, at best it's soft science, at worst its sociology. It's not a science in the same way that chemistry and bio are, but that doesn't mean it's not fairly rigorous and useful (given its assumptions). Higher level Econ is also intellectually stimulating, which is what drives people away from that. It's a shame, really. I think I saw here on /sci/ or somewhere that someone was asked, "if you're so smart why are you in Econ? Why didn't you do...
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>>8171625
>Is economics even a science?
>compared to us engineering majors?
>>
>>8171625
No, they choose a model based on previously held ideology, and then accept anything that model seems to say to them.

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Is it possible that paranormal phenomena have a scientific basis, but we just don't have the adequate technology to detect/measure it yet?

I'd ask /x/ but those people will believe anything.
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>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>/x/
>>
>>8171475
Yes. Carbon monoxide and EM fields have long been suspected as the cause behind "haunted houses". All the pictures are fake including this one.
>>
>>8171475
>I'd ask /x/ but those people will believe anything.
Don't act like you're above them, you're just as stupid as they are

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Is formal science education worthless?

I have a master's in physics, and now nearly 3 years on from graduating feel no more well informed than when I started uni. Was just taught to pass exams, and that knowledge has vanished once I left academia and went into work.

I mean it got me a job, but I don't feel like I really learned anything.
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>>8171452
What is your job?
>>
>>8171465

Work in financial markets for one of the big banks. Mostly FX, some IRM stuff.
>>
>>8171467
And you're surprised that you forgot how to do physics?

What's a quark made of?
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>>8171440
Quark-quarks, of course.
>>
Memes
>>
Packets of energy

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So yeah im thinking about using an aquarium that I have to "create life"

I heard i need amino acids, water, salt and some sort of nutrients (they used glycerin)

But i have a hard time figuring out what kinds of amino acid i should use. does it matter and if yes which?

*And no I'm not an idiot who thinks i will be able to create a complex new species, high likely will it only be a colony of bacteria and nothing more.
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>>8170928
>high likely will it only be a colony of bacteria
>>
>>8170928
You need comets.
>>
>>8170928
you're gonna have to have a sterile enviornment, oh and also arsenic cyanide ammonia electricity you know shit that can kill you

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For the people who live in rural areas or the middle of nowhere.

Is this how your sky looks like during middle of the night? Just want to see if this is bullshit.
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That's a long exposure picture, you won't ever see skies like that with an unaided eye.
>>
>>8170851
I grew up in the country. Town about 10 miles west of the farm.

There was still some pollution but you could see the milkyway.

Op pic uses special low light filters and long exposures.

Another way to see the sky like that is to go out of town and use night vision goggles. Same effect
>>
It's a lot more blue than that. Pretty sure that image is false color, or at least heavily filtered.
And you'll see maybe half the number of stars.

You don't have to go out to the middle of nowhere to see this though. I live in LA and a two hour drive north into the parks will provide a clear sky like that one.

File: dot it for elizabeth(I).jpg (38 KB, 520x720) Image search: [iqdb] [SauceNao] [Google]
dot it for elizabeth(I).jpg
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why the fuck does the second derivative give the inflection point, I don't understand.

also, stupid question threat
23 replies and 5 images submitted. Click here to view.
>>
>>8170781
its the slope of the first derivative?

I guess I haven't really answered it but another interesting way to think about it would be;

Why is the derivative of a distance-time graph equivalent to a velocity-time graph? Same for v(t) to a(t) [acceleration]
>>
>>8170861
I can understand derivatives in terms of velocity / acceleration
But i'm having a hard time picturing (or understanding) how inflection points are given when setting the second derivative equal to 0
>>
>>8170880
because the derivative of a generic differentiable function f(x) is the slopes/tangents of f(x)

visualising this: where f(x) has a maxima/minima the slope is zero so f'(x) will be zero at that point

where f(x) is increasing/decreasing the greatest it will have a peak for f'(x)

continuing this logic you can see that when you take the derivative of f'(x) the peaks become zero's on f''(x) which tell you where the slopes of f(x) are the greatest and the neighbouring points...
Comment too long. Click here to view the full text.

File: 1397185964586.gif (20 KB, 633x758) Image search: [iqdb] [SauceNao] [Google]
1397185964586.gif
20 KB,
What are some scientifically proven methods of increasing motivation?
31 replies and 5 images submitted. Click here to view.
>>
>>8170721
cocaine
>>
>>8170721
1.) Pleasure
2.) Pain
3.) Need
4.) Love
5.) Hate
>>
>>8170721
Amphetamine based drugs

File: IMG_20160407_075847.jpg (105 KB, 640x640) Image search: [iqdb] [SauceNao] [Google]
IMG_20160407_075847.jpg
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Where do you get the latest science news? Particularly astrophysics and technology.
17 replies and 1 images submitted. Click here to view.
>>
>>8170476
Phys.org's fb page is p good, and mit tech review
>>
>>8170476
Arxiv
>>
reddit


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