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Archived threads in /sci/ - Science & Math - 419. page

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>when you're taking notes and your hand starts to cramp up but you can't stop writing
5 posts and 1 images submitted.
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>taking notes
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>>8974295
>>8974302
>Take notes
>End up just writing the entire page from the book down - re-read it, and then begin to whittle it down writing down what it's talking about over and over again over the course of 5 pages until I have it in a short nutshell version.
>End up re-iterating shit every 5 pages or so.
I mean it works I guess. I haven't failed yet.
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>>8974306
This is good, do this

Since every object with mass in the world has some form of magnetic field, would it be possible in the future to create a device that produces that exact opposite magnetic field so the object is no longer has collision? Am I insane?
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>>8974189
Magnetism isn't even a real force. It's not the reason why things don't touch
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>>8974209
explain
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>>8974189
>Since every object with mass in the world has some form of magnetic field
We'll call it Anon's law of gravnetism.

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Is multitasking a bad idea. It seems like it's baked into everything these days. Are there any good papers, articles, or books about this and the science behind the brain?
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From my understanding multitasking actually lowers cognotive performance which was displayed in a small case study on individuals who were tasked with certain mental tests, and those who did something as little as listening to lyric background music (which is considered multitasking due to their brains interpreting the lyrics at the same time as doing the task) had their performance drop to as much as 10%. It was estimated their iq dropped around ten points as well if that is any indicator to you. As far as research papers, this one isn't the best but it has good material. https://www.researchgate.net/profile/Rachel_Adler/publication/220108779_Juggling_on_a_high_wire_Multitasking_effects_on_performance/links/559951b508ae99aa62cc51c5.pdf
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Thanks anon. I'm a computer hobbiest and I've tried different interfaces. That is my main point of interest really. I know most people are phone users, but I'm interested in human computer interaction. The most interesting point I see is that the command line has survived at least 40 years and still remains relevant.
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>>8974172

Yes, it's a poor idea because of how the brain works. By constantly shifting your attention, you're wasting your limited memory capacity by having it "hold on to" stuff while you deal with something else, and, you are confusing the various agents in your brain by using them to do two things at once. Do one thing at a time until you finish it,you'll find you're way more productive.

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Are biorenewables the alchemy of our time?
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>>8974157

Hardly, oil has been made from all kinds of things throughout history.
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>>8974157
Humanity started out using biorenewables.
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Bioprocesses always require too much energy or water to make them reasonable. I know some people working on developing minimal cells for the purpose of bioproduction, maybe they'll get some traction there.

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Teach me enough to become a biochemist mastermind, /sci/.

Let's humbly start with the following:
-top 15 chemicals that improve your brain/health
-top 15 chemicals that can slowly kill you.
-how do I genocide the cockroaches? And mosquito's, flies, spiders.
-Control of hair growth.
-Control of ovulation and bio processes in general.
-A bio luminous mouse (baby tier)
-How to fireworks (Chinese tier)
-how to predict if it's going to be a boy or a girl. (Gipsy tier)
-Cooking (hardmode tier)
-Mind control/mood inhibitors(fantasy tier)
3 posts and 1 images submitted.
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>>8974116
Uhhhhhh.... you should retake highschool biology
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Guys.. op is overwhelming me again.

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Open source from a website called awnlcg9zzwlkb24.com with IOIOOIOIIOOIOOIOIOIIOOOIIOOIOOIOIOIOOIOIIOIIIOOOIOIOOIOIIOOIOIOIIOIOOIOIIOOIOOIOIOIIOOOIIOOIOOIOIOIOOIOIIOIOIIIOIOIOOIOIIOOIOIOIIOIOOIOIIOOIOOIOIOIOIIOIIOOIOOIOIOIOOIOIIOIIIOOOIOIOIOOIIOOIOIOIIOIOOIOIIOOIOOIOIOIIOOOIIOOIOOIOIOIOOIOIIOIIIOOOIOIOOIOIIOOIOIOOIOIOOIOIIOOIOOIOIOIOIIOIIOOIOOIOIOIOOIOIIOIIIOOOIOIOOIOIIOOIOIOIIOIOOIOIIOOIOOIOIOIIOOOIIOOIOOIOIOIOOIOIIOIIOOOIIIOOOOIOIIOOOOIOIIIIOOIOIIIIOIOI in the open source.

1010010 1100100 1010110 0011001 0010101 0010110 1110001 0100101 1001010 1101001 0110010 0101011 0001100 1001010 1001011 0101110 1010010 1100101 0110100 1011001 0010101 0110110 0100101 0100101 1011100 0101010 0110010 1011010 0101100 1001010 1100011 0010010 1010010 1101110 0010100 1011001 0100101 0010110 0100101 0101101 1001001 0101001 0110111 0001010 0101100 1010110 1001011 0010010 1011000 1100100 1010100 1011011 0001110 0001011 0000101 1110010 1111010
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>>>/x/
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>>8974062
probably some stupid shit that an obnoxious Twitch streamer is going to do
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>>>/g/60888720

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>attended this course years ago
>didn't take the exams
>I have to now
>I thought I might remember something
>I don't

Should I embarrass myself by showing up just to take a peek at the questions?
Or should I just give up for this semester?
1 posts and 1 images submitted.
No replies in the DB for this post!

Hey /sci/, /out/+/k/ here with a question, figured either you or /an/ could explain this shit to me. My dog is instinctually terrified of thunder, and has the same fear of fireworks. But around gunfire he gives no fucks. On the 4th of July he's a whimpering mess, but I can spend all afternoon plinking in my backyard and it doesn't phase him. What's up with that?

I mean the variance in tone and decibels between fireworks going off and small arms between a .22 and 12 gauge going off cannot be that different. If he was afraid of thunder but not fireworks and gunfire, that would make sense, if he was afraid of all three, that would make sense. But how is it he's scared of thunder and fireworks, but not my mossy nugget? What quality distinguishes that sound from a scary sound in his primitive dog brain?
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obviously dogs can hear the difference
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>>8973874
But it's not just one difference. Different fireworks have different payloads. Different cartridges have different measures of powder. Either is variable, so how does he distinguish between either?

Is it the barrel? Is it the different between the explosion being channeled or unfocused? That's a simple explanation, but could it feasibly be the one? Could selective breeding really have acclimatized them to the specific acoustics of gunfire because it was directed? Granted, most of the dogs I've owned have been hunting dogs or related breeds, and we've done a lot to influence their evolution, but to have it pin-pointed that precisely...it's kind of baffling.
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>>8973863
Gunshots are just loud quick bangs, they sound unnatural because they are unnatural.

Thunder sounds like the low growl of a giant animal. Your dog is scared because it's a submissive bitch.

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How is DNA organized above the level of the nucleotide chain?
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>>8973849
Fuck off, no one is doing your homework for you. Lazy little shit.
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>>8973849
So DNA can be organized into 'introns' and 'exons'.

Introns are sements of DNA that stay 'in' the DNA that gets out of the nucleus to make matter from the information of DNA.

Exons are un-necessary remnants from viruses that tried to overthrow your genetic code to explode after making tons of more viruses.

Most people agree exons are useless and over 90% of the human genome is trash that should be removed and would solve world hunger.

Also, you have to know about post-translational modification.

After leaving the nucleus, which is the process known as translation, sometimes the DNA has covalent and other modifications done to it. This is called post-translational modification.

It can change the product of your DNA to include important features like inhibition of reaction coordinates.

All this can be found in the textbook. Use the index to reference the page number.

Good luck with your career in science.

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From a mathematics background

Where does one start learning about plasma physics?
The current extent of my knowledge is "Maxwell's Eqtn.s plus Navier-Stokes = MHD Eqtn.s"

anybody got an intro text to recommend? what would be even cooler is a sequence of texts from basic to advanced, but I wouldn't impose unless you knew offhand.
3 posts and 1 images submitted.
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there must be at least one physicist goofing off right now
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it's too broad a field to go from there

Plasmas are in everything from neon lamps over plastic coating, scar tissue treatment, car starters, energy facilities, welding, arcjet propulsion...

high/low p, T, frequency, ionization, etc. what are your parameters?

are you asking for academics or applications?

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Why are there only stromatolites in Australia?
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>>8973709
They're also in Mexico and Brazil
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>>8973709
There are lots of things other then stromatolites in Australia. Lots of rabbits eg.
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>>8973767
kek

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What can be done with this software NASA released?

https://software.nasa.gov/NASA_Software_Catalog_2017-18.pdf

It seems like a lot of potential
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>>8973637
if you print it out you could whipe your ass with it.
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>>8973637
I havnt looked at the codes yet. but saving it for documentation cant hurt.

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i'm getting bored
let's list all the ISS Expeditions
i'll start
>1 Expedition
>started in 31/10/2000
>ended in 21/03/2001
>purpose: setting up ISS systems and stocking stuff received by the previous spaceships
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https://www.youtube.com/watch?v=EvmED6XH-3Y
>purpose: mugging at the camera and blowing away decades of effort by briefly hooking a finger on an invisible cable

And have you seen the older ISS videos? Long hair is hard to fake apparently

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It's me again, and I've changed my question. Is it possible for the following to happen by application of a potential difference?
[math]Cu^{2+}+2SO_4^{2-} \rightarrow Cu_{(s)}+S_2O_8^{2-}[/math]
Or will oxygen gas be released instead? According to the standard cell potentials and maybe a little common sense, oxygen gas will be released instead, but surely there's some concentration at which the reaction will happen the way I want it. I'm not experienced enough using the Nernst equation to know how to deal with solids and liquids messing up my reaction quotients, especially when calculating the individual half-cell reduction potentials.

Alternatively, are there any other oxidants I could use to replace the sodium persulfate? I know there are plenty out there at varying potentials, but most require acidic/basic conditions. If I was to "charge up" this cell and have to do so in acidic conditions, the cell would still be in acidic conditions when I want to "discharge" the cell, making it unfavourable. Would a stoichiometric quantity of acid work? I wouldn't be trying to extract any energy from the cell by discharging it, I'd actually just let it react with itself, would this make it less unfavourable?

The cell can be anything as long as it oxidises and reduces copper completely reversibly, and preferably uses easily acquired chemicals.
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>>8973344
Seems possible, but too lazy to make theactual thermodynamic calculations. Did you check the standard reduction potential? People who work on this make the calculations for every single route, so maybe you should do that as well.

Hopefully is not bigger than 1, or you get water decomposition as you say. Need to review the basics, if you find the answer post it anon.
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>>8973391
What potential do I need to use for the oxidation of water? Is it the 1.229V acid equation (in bold on the wikipedia data page) or the 0.401V hydroxide equation? I do plan on going through the full Nernst equations algebraically to find the answer I'm looking for, but I'll have to do it with the full cell potential, not with the individual reduction potentials.

A higher reduction potential means the reverse reaction (the oxidation) is less favoured, right? A solution of copper bromide looks somewhat promising, along with a couple of noble-metal chlorine complexes and a mysterious [math]I_3^-[/math] ion.

[math]CuBr_2 \rightarrow Cu_{(s)}+Br_{2(aq)}[/math]
Makes me wonder if the solution would have trouble conducting once the reaction is almost completed, I'd probably need a mixture of NaBr and CuBr2 and store it with the copper reduced out of it.

There are plenty of cations I could use instead of anions, but they'd probably have to be sulfates or some other soluble non-oxidisable-anion salt. Iron is the main one that comes to mind.
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>>8973420
what half reactions do you have? what potentials do your reactions have? what do you want to achieve?

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Last thread was the most popular in the last 7 months, getting to a bumplimit much quicker than any "sqrt" thread, which is not surprising since that guy doesn't give a fuck about science OR /sci/.


"Stupid"/Simple/Stupid Question General starts here.

Proper OP pic, OP post and OP fag.

1. Don't ask without having tried
2. Ask for solution, not the answer.
3. See if you can answer any questions while waiting.
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Thread already up:
>>8969578
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>>8973317
> sqt false-flagger is on duty
Fuck off, retard, you don't fool anybody.

The truth is your threads are degenerated long time ago and it's too late to attract people back to them.

So GTFO or join this thread.
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>>8973321
Who hurt you?

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