Archived threads in /sci/ - Science & Math - 73. page
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Anybody remember this picture from 2012?
This dude discovered it from NASA's photos: https://www.youtube.com/user/rob19791/videos?sort=p&view=0&flow=grid
It was all around the news worldwide. NASA quickly removed this picture after that and covered it up and confused people by showing another picture. This got completly forgotten, it vanished from the web and I think the fact that NASA quickly removed it shows that this could be our first picture from a real ufo. (It's said that it is about the size of Jupiter)
cool
DUDE ALIENS LMAO
You seem to mistake /sci/ with /x/
I have two signals, each one of them is a sum of random cosine & sine waves.
I need to classify them using a clustering algorithm.
How do I go about that using python?
classify what exactly?
>>8143761
I don't know this question is driving me crazy.
That's all what the exercise says.
My best guess is classify them according to the frequencies maybe?
Don't know what the clustering algorithm part of the question is talking about. I would use an FFT in Python using NumPy so you can get a graph with frequency on the X axis. There you will be able to see the frequency spectrum and understand what sine and cosine waves went into making your signal. You'll get awesome graphs if you make sure the frequency resolution is 1 Hz or smaller, but I don't know what you mean by "classify".
If brain uploading technology was available, would you undergo it?
>>8143537
It depends on the implementation. I don't want a copy of me to live forever, I want to live forever dammit.
>>8143550
If you duplicate your entire memory accurately, do you also duplicate your consciousness ?
>>8143552
I'm not well versed in the philosophy behind this by any means, but I would think that if my entire memory was duplicated, the resulting mind would be conscious, but distinct from myself.
I don't know how to describe it, but for it to work out and actually be "me" I think there would need to be a "continuity" between my brain and whatever it is uploaded to.
How does it go from the first step of the first line to the second step.
>>8143519
It doesn't. There's nothing here more than 1 line.
>>8143519
He splits up the integral from -1 to 1 into a sum of two integrals, one from -1 to 0 and one from 0 to 1. Then he substitutes in the f(x)*g(x) depending on the values in each domain: from -1 to 0 f(x)*g(x)=abs(x)*1 and because x is negative in this domain it just equals -x.
Yo wait up. You go to FIU OP?
![P08-We-Need-You-NASA-Recruitment-Poster-600x[1].jpg](https://i.imgur.com/RVn2tlO.jpg "P08-We-Need-You-NASA-Recruitment-Poster-600x[1].jpg")
NASA WANTS YOU !
TO COLONIZE MARS !
![P01-Explorers-Wanted-NASA-Recruitment-Poster-600x[1].jpg](https://i.imgur.com/AjMXukC.jpg "P01-Explorers-Wanted-NASA-Recruitment-Poster-600x[1].jpg")
Ready to gear up ?
k keep me posted
![P02-Work-The-Night-Shift-NASA-Recruitment-Poster-600x[1].jpg](https://i.imgur.com/003DMJm.jpg "P02-Work-The-Night-Shift-NASA-Recruitment-Poster-600x[1].jpg")
>>8143429
k
Is time real, or is it just a social construct that only exists within our brains to measure chain reactions in the universe?
>>8143364
>social construct
>only exists within our brains to measure chain reactions in the universe?
These are two different things, and no to both, see special relativity where the physics of fast-moving objects are significantly more accurately modeled when considering a temporal dimension in addition to the spacial dimensions.
>>8143364
Time is just a social construct you bigoted shitlord. Don't impose your temporalnormative standards on me.
![180px-Sodium_bicarbonate[1].jpg](https://i.imgur.com/ZpKTrky.jpg "180px-Sodium_bicarbonate[1].jpg")
So I know cancer develops in acidic environment and soda is a base. I drink it sometimes with lemon juice. Is a spoon of baking soda every few days any dangerous for your insides?
Is flapping ears the secret to flying?
>>8143243
it does provide lift
Could a working one actually be built?
Well. One way to go about this is by pointing out the problems with the fictional design. Two are immediately apparent.
One: no stabilizer. The torque from the rotor would have you yawing uncontrollably.
Two: the controls suck. In the setup shown, you could bank left and right, but pitching forward would be awkward and difficult at best.
Not unless his whole body is being dedicated to the copter's mechanisms.
>>8143192
>you yawing uncontrollably
what if im not tired? or bored
Please help /sci/ I hate asking for help with this but I've been getting frustrated trying to figure out what this is asking for over 10 hours. I usually am a few sections ahead of the class, but I wasn't for yesterday's lecture. Can some kind anon please point out what is being asked here and what strategy to solve this is?
>>8143065
What is this i, j, k bullshit? Why not just call it v=(7,1,a)?
>>8143157
It's the historical notation from Gibb's which was taken from Hamilton's quaternions which was taken from a+bi forms of complex numbers
>>8143161
But they're not quaternions though and it's really cumbersome notation.
Peter Dockdrill is right.
We were born too soon.
;_;
I guess we'll wait until the Drumpf lineage is no more as to not scare away any alien lifeforms
>>8143036
Reddit pls
>>8143035
Unless you are alive when first contact is made it won't be magical anyways. You'll just have grown up accepting it is a known fact and accept it so it probably won't be that interesting.
What does /sci/ think of the ACT? For those who have taken it, what score did you get?
Can you take the ACT or SAT at any age? Say someone in the Military wants to go to a top 25 Uni and didn't do well in highschool. Could good scores on the tests allow you to be accepted into the schools?
Basically the same thing as the SAT, especially the new SAT. Although the difficulty is actually identical for all intents and purposes, compared to the old SAT at least it was easier to get a score "of note" because the scores fall into much more broad categories. There are basically 6 upper level scores you can get 36, 35, 34 etc. while with the old SAT and somewhat the new SAT its more continuous. In other words it can make you look better than you actually are when you get like a 34, and it could be a low 34 or a high 34 or whatever, and since theres only two scores...
Comment too long. Click here to view the full text.
Much prefer it to the SAT because of the 1/4 point penalty for wrong answers on the SAT, the way the ACT is organized (four sections then essay as opposed to like essay then 10 small sections or some shit), the ACT goes o higher math, and the fact the the college board administers it. Fucking hate CB
I just like math and I think it would be interesting to see what kinds of things are being done by real mathematicians today
Were can I go to see this? "math news" isn't really a thing
They're all working on something. They can't really give away hints in the math world or else you'll have sneaky snakes come in and steal their work. Thus, nothing happens until you publish it and prove your work. Otherwise you'll look like a dumb ass
>>8142925
just go to the arxiv or read some math blogs like Tao's blog.
Honestly if you want to know what current researchers are doing, just read current research.
>>8142947
yeah but... were?
I'm not a student or anything
Back in Calculus the professor was adament about dy/dx being a notation, like y', and not a quotient itself. Why then do we use "seperation of variables" in differential equations, taught by cross-multiplying. Is it not actually that process? Even in my book, it reads that to solve dx/dt = -kx, multiply both sides by dt/x. This assumes dx/dt is a quotient and not a representation of the derivative. I understand it works, can someone help me understand why?
>>8142755
[math]\int \frac{dy}{dx} dx = \int dy [\math]
[eqn]\int \frac{dy}{dx} dx = \int dy [\eqn]
there is a rigorous real analysis-y process I recall my professor going over in lecture which justifies the whole thing. but I forget. For me, it is often sufficient just to know that it can be justified, rather than to know the justification.
![Cryptococcus_neoformans_using_a_light_India_ink_staining_preparation_PHIL_3771_lores[1].jpg](https://i.imgur.com/1GMez6B.jpg "Cryptococcus_neoformans_using_a_light_India_ink_staining_preparation_PHIL_3771_lores[1].jpg")
https://en.wikipedia.org/wiki/Radiotrophic_fungus
>Radiotrophic fungi are fungi which appear to use the pigment melanin to convert gamma radiation into chemical energy for growth.
>These were discovered in 1991 growing inside and around the Chernobyl Nuclear Power Plant. Research at the Albert Einstein College of Medicine showed that three melanin-containing fungi — Cladosporium sphaerospermum, Wangiella dermatitidis, and Cryptococcus neoformans — increased in biomass and accumulated acetate faster in an environment in which the radiation level was 500 times higher than in the normal environment.
I have a question, why don't we just get a fucking bunch of this shit and put it all over Chernobyl to absorb all of the radiation out of the air to make the place habitable sooner?
>>8142733
It's a big planet, with an indigent species, they'll go somewhere else, everywhere else first.
they dont get rid of the radiation, they put a small blanket over it and use a tiny fraction of it
>>8142733
>absorb all of the radiation out of the air
Woman or biology major ?
Could Neanderthals have been another race of modern man, or are they too distinct to be considered a race? This also goes for anything from Erectus to Habilis.
Subspecies is the most controversial yet best fit descriptor desu
>>8142627
So it's not just racial difference? Ok then.
