/sci/ - Science & Math

OP here. Addressing some comments.
(1) Diet: I had a junk food addiction which I cured. I lost a lot of weight, going from obese (bmi 30) to normal weight (bmi 23).
(2) Exercise: I walk a lot but never done anything more taxing than cardio.
(3) Activity/energy level: I have a hard time doing things and am bored almost all the time.

Blood pressure is 95/78. Is this bad?

>>12762994
Wait a second...the earth isn't a perfect sphere...

>>12744109
ITT: OP Fucking Obliterates The Entire Internet

Unlike black holes there's not much talk going about this.
In a nutshell, if black holes are like punctures in spacetime, these things are like cracks in spacetime.

These are some facts I could gather about them:
>a cosmic string is extremely thin (near 1D) but very long (spans across the universe).
>a cosmic string is extremely massive. 1km is as heavy as earth (and remember, their length spans across the universe)
>a cosmic string moves extremely fast, loops around itself often and obviously causes gigantic gravitational waves as it does so
>at least one is predicted to exist in our observable universe.

How fucked are we should these things exist? They could literally slice through a galaxy and wreak havoc, scatter all its stars thus completely destroy it. Imagine if it sliced through earth though?

Imagine if you were on board the Challenger and you were informed of the problem 1 second after liftoff, knowing full well that you were going to die and there was absolutely nothing you could do to stop it.

>>12591939
Kn-know what?

I messed up, please tell me how to fix my brain guys. I always watch youtube videos with at least two times normal speed, sometimes even more than 3x if someone is talking particulary slow. This of course took some time to get used to but after a couple of years this just feels very natural to me. But since I got so used to it I can't just focus on my teacher talking about anything in normal speed and my mind eventually drifts away. Now with corona I am luckily in a position where I can just play the video he recorded faster because all my lectures are at home anyways but I fear that I have permanently fucked up my brain.
I would like to keep the processing speed I have trained up though because it is really convenient, I just want to be able to listen to normal paces and not loose focus when someone makes a 2 second break between two sentences (this is of course a little overexaggerated but I usually do loose focus when someone speaks slowly for more than 10 minutes)

m-maybe God is just making an RL experiment with us where if you get killed you "lose" and just wants to see who will survive and what will happen in 1000 billion of years

basically this but in a larger scale https://www.youtube.com/watch?v=Lu56xVlZ40M&t=275s

>>12240287
Same reason everything leaves a comfortable environment.
Hunger.

Can I give myself carpal tunnel surgery? It hurts pretty bad at this point, and I'm a poorfag. It's just cutting that tendon, right? Could I do it with some painkillers, a scalpel, and videos online?

How accurate are polygraph tests?

Guys I accidentally said something racist in class, what do?

>data analysis class
>doing analysis on data sets that detail performance on a math test for middle school kids for schools of varying backgrounds
>each individual is measured in the following variables: age, sex, race, socio-economic background, middle school grade, test score
>were discussing the results of our analysis with prof
>prof notices some schools have a very positive skew for test scores, asks why
>lots of people start answering things like socio-economic background and age even if there is little no corretalion between positive skewness for test scores and those variables
>in my analysis, race and positive skewness have a correlation of .89
>point this out without thinking about it
>class goes silent
>prof laughs and says something like "well but that cant be it" and goes on
>after class I get a text from the 2 girls in class asking me why im racist

Wtf should I do now? I just wanted to do data analysis, im not racist and I dont care for politics at all!
Should I do other analysis to try to find an alternative explanation for the positive skewness?

Yes sir Political Comissar Sir, I do toe the party line regarding police violence. No need to look into me sir.

https://en.wikipedia.org/wiki/Black_hole_electron

>>11535729
I don't know, seems like it broke into some kind of new strain. A mutation? Either way, we have people in their mid-twenties dropping like rocks here lately.

>>11349051
b-b-but nothing ever happens... r-right?

>>11335155
>>11335166

Okay. NOW I am shitting myself.
>But they haven't?
What are you not telling us!?

>>11330148
>whose immune systems overreact to the virus
You didn't tell me it uses fucking JUDO.
SHIT SHIT SHIT. Do you know what causes overractive immune responses? If your guess was "stress", like say, locking down an entire city at gunpoint, then you would be CORRECT. Why tf is this being handled in mass containment units?!?!

I have to take calculus 1 in uni this winter but have been bullshitting my way through math all through highschool with ti89. Whats best way to not get fucked because i barely know the algebra

Guys I've been drinking out of PET plastic bottles for years now. How fucked am I?

mathlet here

I was trying to integrate e^(-x^2) from -n to n

I considered e^(-x^2-y^2) instead over [-n, n]^2 and did the switch to polar coordinates (x, y) -> (r, theta) calculated the jacobian
And ended up with

e^(-r^2) r dr dtheta

However, what the fuck do you do with the limits ?
Is this where math fails? I can't represent a square with polar coordinates or some shit?
Its easy to approximate with the circle inside the square and the smallest circle which contains the square but
I have never actually seen any discussion of this in any text books, or heard any professors mention this shit. It's just been informal handwaving how to get the new limits for the integral
I mean, are you even allowed to do the transformation if you can't represent the domain approriately?

>>11120234
Hence
>>11119789
Really nailed down the ultimate doomsday devices of the three disciplines...
Wh-What do you work as?

Is there a way to cure anhedonia?
I can't fucking enjoy anything anymore.