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Archived threads in /sci/ - Science & Math - 231. page
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File: _80461814_photonrace[1].gif (345 KB, 1024x576) Image search: [iqdb] [SauceNao] [Google]
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Can particles without a speed limit exist ?
>>
>>8193688

Let's define particle mememesfriend as having 0 information. Wow, no speed limit.
>>
>>8193707
wouldn't the inexistence of mass be enough ?
>>
dunno lol

File: IMAG2663.jpg (339 KB, 2688x1520) Image search: [iqdb] [SauceNao] [Google]
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What's the best entry level chemistry work/textbook?

Ive looked into the Chemistry Workbook for Dummies, which gives assignments and practice as well as covering simple chemistry, but something that covers more of an in-depth scope is appreciated.

(Microbiology and pathology books also accepted for fun)
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>>8199305

Lehninger - Principles of Biochemistry

Alerbts, et.al. - Molecular Biology of The Cell
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>>8199317
Thanks, I'll check these out
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>>8199305
General Chemistry: Principles and Modern Applications - This book covers almost all areas of chemistry, and is used as the main chemistry undergrad book in many universities.

Organic Chemistry: A short course - Nice introductory book to organic chemistry and organic reactions.

File: Sears-Haack.png (30 KB, 1089x716) Image search: [iqdb] [SauceNao] [Google]
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why aren't the cross sections of wings shaped like the Sears-Haack body?
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>>8196991

Which wings?
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>>8196999
airplane wings.
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>>8196991
Why should they be?

2 MB,
Does modern math have an explanation for mind-reading tricks like pic related? Do we need to create a new system where things like dividing by zero are not impossible?
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>>8195537
X
X*2
X*2+10
(X*2+10)/2= X + 5
X +5 - X = 5
>>
File: 1466916958797.png (343 KB, 671x1047) Image search: [iqdb] [SauceNao] [Google]
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[eqn]
\begin{aligned}
\sqrt{2} \cdot 2 &= 2\sqrt{2} \\
2\sqrt{2} + 10 &= 2\sqrt{2} + 10 \\
\frac{2\sqrt{2} + 10}{2} &= \sqrt{2} + 5 \\
\sqrt{2} + 5 = 5
\end{aligned}
[/eqn]
O-Oh...
>>
>>8195537
>>8195540
This image only works for integers between 1-10

So what happens when the ISS is decomissioned in 2025 ?

Do space agencies nowadays have the budget to put something back up ?

Will it be the end of continuous manned spaceflight ?
>>
>>8199842
The space shuttle was the end of manned spaceflight. ISS is just like the tatrail of a headless snake still flopping about. It's up to private companies now, unless there's a major change in the world's priorities, that I just don't see happening.
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>>8199847
I take it you've not been keeping up with space news. There's no longer big hoopla in mainstream media but the private sector and Chinese are sending shit up constantly including people.

>>
>>8199847
The last space shuttle flight was only like 5 years ago and is being replaced by Orion using Delta IV Heavy/SLS.

How come neural nets get so much more attention than support vector machines these days?
>>
>>8199555
Can a SVM make trippy pictures? I thought so.
>>
DUDE IT'S NEURAL LMAO

but both are shit desu.
>>
>>8199555
Because of deep learning which lets you solve harder problems. It's also worth mentioning that there are a fuckload of huge frameworks for working with deep neural nets as well as nvidia libraries and shit.

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Why do our alcoholic drinks contain ethanol, and not isopropanol?

A quick Wikipedia search verifies that both substances have almost the same lethal dose.

On top of that, isopropanol is metabolized to acetone, which is not only much less toxic than ethanol's metabolite, acetaldehyde, but non-cancerous as well.

What am I missing here?
>>
>>8199508
um taste, maybe?

Ease of production?
>>
>>8199508
Go drink a bottle and post results.
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>>8199508
Find a yeast that selectively produces isopropanol then report back.

File: FILnI2X[1].png (5 KB, 173x225) Image search: [iqdb] [SauceNao] [Google]
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Is tau really superior to pi or is it just a meme?
>>
Anon, do you really need someone to explain you the difference between π and 2π?
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>>8199475
No, rather the difference between 2π and τ.
I know they have the same value, but people still use one or the other. Why?
>>
i think pi is for non-physicists/brainlets with -0.999... IQ

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So I was helping an algebra student with his homework, and this quadratic came up.

[eqn]\sqrt{2}x^2+(2\sqrt{2}-2)x-4=0[/eqn]

I can verify using the ABC method and just by plugging into the function that the roots are $\sqrt{2}$ and $-2$. But for the life of me, I can't figure out how to show this with the quadratic formula.

[eqn]x=\frac{-(2\sqrt{2}-2) \pm \sqrt{(2\sqrt{2}-2)^2-4(\sqrt{2})(-4)}}{2\sqrt{2}}[/eqn]

Any ideas how to simplify this? I've tried every method I can think (factoring out of the square root, multiplying...
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>>8199403
dont be lazy. open up the expression in the root, then divide the numerator by the denominator. that's it.
>>
foil on the first term under the square root
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>>8199421
>>8199429
Try it yourselves, the radicals don't go away

File: 2016-07-12.png (208 KB, 1140x831) Image search: [iqdb] [SauceNao] [Google]
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Why is it this a problem? My prof always shrug this off as something very delicate about the notion of infinity so unless we are careful we will be wrong. But this seems to be a philosophical answer more than a mathematical one.

Surely there's a well thought out reasoning using proper mathematics that explain what kind of rearrangement is acceptable.

Riemann only ever said you can add up converging alternating series to any value you want by rearranging right?

I am guessing this have to do with the fact that we have infinite amount of positive and negative term, so it is possible to do arrangement such that we can use it to approximate the summation to any value without "exhaustion" in a sense. Since our series is an convergent alternating series, our approximation will get better.

ie 1/100 - 1/1000 + 1/10000 ....... we can take the the positive term to some value up, then take the negative term to reduce it to some value down and our approximation will get better because the terms get smaller.

But this is done via choice, not algorithmic, so while I understand the idea, it feels incomplete and doesn't capture the full picture for me.

Is this also true for non-alternating series? Surely not, since we will only have either positive or negative terms.

>pic related
????
>>
>>8198964
>But this is done via choice
Not a problem. We're doing math here and not CS. An existence argument is sufficient.

>Is this also true for non-alternating series?
It is true only for conditionally convergent series, i.e. those which converge but don't converge absolutely. This implies that there are infinitely many negative and infinitely many positive terms.
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>>8198995

>Not a problem. We're doing math here and not CS. An existence argument is sufficient.

is this pretty much all I need to do show that every convergent alternating series can be manipulated to be equal to any value; QED?

>It is true only for conditionally convergent series

Then why can't I manipulate the sum of 1/(n^2) any way I can?
>>
>>8198964
>alternating series
please do not use that word.
riemann showed that any convergent series that DOES NOT CONVERGE ABSOLUTELY can be rearranged to converge against anything we want

Every time someone talks to my son he traces their words into the couch he'd be sitting on, his pants, etc. What could this mean?
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>>8198952
How old is your son? What level of cognitive abilities does he possess?
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>>8198952

That is literally autism
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>>8198960
He's 7

File: bobbylupo.png (248 KB, 500x300) Image search: [iqdb] [SauceNao] [Google]
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is consciousness ultimately separate from and independent of the brain or is just an inherent byproduct of the amalgamation of our most common thought patterns?
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>>8198894
Consciousness is a quantum mechanical phenomenon.
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>>8198894
>Consciousness
It's just a manifestation of your physical neurology, there's nothing to else to it.
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>>8198896
>there's nothing to else to it.
Denialist pls go.

File: plato aristoteles.jpg (10 KB, 302x167) Image search: [iqdb] [SauceNao] [Google]
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Eliminative materialism is the only thing that makes sense and psychology in general must adapt this principle. Your thoughts?
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>>8198868
>>/his/
Philosophy board.
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>>8198868
p-zombie pls go
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>>8198870
Philosophy of mind = philosophy of science with focus on psychology. I dont think /his/ is the appropriate place to go when discussing science.

I saw a report on mangroves on about how over 10,000 hectares of mangroves have died in Australia, and no one is paying attention to it since they are visually appealing. They seem to fairly important to the environment however, and I just wanted to know exactly why?

Also, there has been no set reason as to why they have all died apart from lack of water however I'd like to know about some other factors. So, my questions are; What are mangroves and what are their adaptations to deal with factors such as salinity, substrate, oxygen availability and wind?

Thanks!
>>
Pneumatophore's are an adaptation to low oxygen.

IIRC magrove habitats store more carbon per hectare than regular forests, and provide a nursery for the juveniles of many species of commercially important fish species.
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>>8198838
Mangroves seem pretty neat.
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>>8198840
Also, Grey mangrove (Avicennia marina) excrete salt on the underside of their leaves.

Lick the leaf and you can taste it.

Is this map legit? I mean IQ lower than 70 would mean you have some form of developmental disability in the first world, but there are actually countries where half of population has even lower scores than that? How would they be able to run a functioning country if this was for real?
>>
low IQ = slower development
pretty simple concept
>>
Its probably from Lynn
Look into him at wiki and his "IQ and wealth of nations".
He does shitty approximations.
In one country in Africa for example his only basis for the IQ is a shitty cultural IQ test on 14 year olds.

Although there are real differences in IQ between nations, but the most effect has malnutrition.

For example a deficit in iodine and a change of the iodine diet after that let to an increase of 15 IQ points from 85 up to 100
>>
>>8198727
This is purely conjecture, opinion and anecdote, but you can train yourself for IQ tests.

Schooling system may actually develop your thinking in a way that increases your IQ. That would pretty much also explain why many East-Asian countries seem to perform better than western countries.

I see it as a case of chicken and egg. Does a non-functioning country create people with lower intelligence, and do smart people want to stick around anon-functioning country, when they can leave and make use of their...

File: wh.png (130 KB, 500x611) Image search: [iqdb] [SauceNao] [Google]
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>Working on ground-breaking robotic medical device at SV startup
>Doing significant work using ROS, machining with my hands, PCB design
>Often have to work 65-70 hour weeks
>I'm getting paid $9 a fucking hour Why is this allowed? Jimmy the fucking shift manager at mcdonalds makes twice what I do. Why is this allowed? I'm a mechanical engineering intern from Caltech. Can someone tell me why this is allowed? I understand I am... Comment too long. Click here to view the full text. 40 replies and 4 images submitted. Click here to view. >> >>8198704 >Jimmy the fucking shift manager at mcdonalds makes twice what I do. You are doing something meaningful and you have a future. Fuck off with your whining. >> >>8198707 I understand, it's great, it's great - but there's a lot of shit I want to buy for myself (Vive compatible PC + Vive so I can do my own development w. unity) and I physically cannot buy SHIT because I get paid rent+food essentially. >> >>8198708 >Vive compatible PC + Vive so I can do my own development w. unity You're doing robotics in SV and you want to jump on the meme development wave with a$2000 pc and \$600 meme-o-vision with memewands? Don't be an early adopter, anon. VR will be MUCH better in two years, when you have income.

File: url.jpg (7 KB, 284x177) Image search: [iqdb] [SauceNao] [Google]
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Can anyone link a video of anything that has gone high enough to film the curvature of the earth that does NOT use a fisheye lens??
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>>8198595
If you do not trust the images by any of the numerous space and aeronautics agencies, I don't know what to say to you.

You seem to assume it's all false rather than actually approaching this with an open and curious mind, in which case, what's the point in responding?
>>
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here ya go
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>>8198599
fist, I didn't say what I believe so don't assume
Also, i'm not saying all the videos/pictures are fake that they put out

I just want to see a video that doesn't use a fisheye lens because I can't find one do you know of any?

>>8198600

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Ok, I agree flat earth is some bunk.

But Hollow Earth? Was Admiral Byrd a kook?
>>
They would have figured out the earth was hollow a long time ago through the behavior of seismic waves from earthquakes. The Earth does not behave like a hollow object.
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>>8198591
How would you explain the earth's magnetic field? Also, we know the mass and average radius of the Earth and thus the average density. This density is much higher than the density of the crust (which we can measure directly), thus there's more dense stuff underneath. Also volcanic activity.

It would take quite a lot of patchwork to explain a hollow earth. The fun part is that Gauss's law tells us that a hollow earth will behave exactly as a solid earth in terms of gravity and orbit (if they have...
>>
>>8198602
>>8198604
I think OP means an earth that is a gigantic centrifuge in terms of gravity, and light doesn't travel in straight lines.

In which case I really have to question how orbits work.

Milk in the US is laden with hormones and whatever else garbage. How can anybody do proper studies when it's almost impossible to purchase milk in the US that hasn't been tempered with?

I grew up on the outskirts of a city and drank mostly fresh, raw goat milk since we owned a goat. I never had any diseases or parasites growing up. Moving to US I was shocked to find out what people actually called milk.

I can't say much about milk's effect on bones but I can say that drinking milk in the US is a bad idea.

There's several studies...
>>
Goddamn it, this was meant to be a reply, not a new thread.
>>
>Hirasawa
Good taste.
>>
>>8198751
enlighten me

Hey /sci/, I am extremely interested in learning electronics. Are there any really good and insightful books, YouTube videos, ect. for beginners?
>>
>>
>>8198424
>>
What kind of electronics do you want to learn? If you are interested in pic related, you should read the relevant chapter in Griffiths' book: Electrodynamics. That'll give a fundamental understanding. If you are interested in practical electronics, don't bother. Hall has a good book, but you may not have the will to read through that thing (it's the best book you'll find, but that doesn't mean I think it is any good). I would advise getting some equipment for tinkering. Learning the theory behind circuits is great, but actually building them afterward...

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

Do i know chinese or not?
>>
Useless word games. There are no insights to be gained in thought experiments like this, save about the limitations of our language(s). And most do not even make it that far.
>>
Well its not completely useless. It gives us an insight of how especially the field of psychology and how the avarge man looks at a why humans do why they do. The dualistic split between a) he is speaking chinese, and b) but he does not understand it.
The understanding part part is so broad and nearly not measurble at all.
>>
>>8198100
what's wrong with this thought experiment?

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What is the evolutionary advantage of listening to music?
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>>8196812
what is the evolutionary advantage of not listening to music
>>
>>8196816
>>
>>8196812
Our enjoyment of music is, however, a consequence of our brains ability to detect patterns, which is evolutionarily advantageous.

File: chem phd.gif (627 KB, 500x363) Image search: [iqdb] [SauceNao] [Google]
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I have my first official day tomorrow as a PhD student. I am starting by doing a lab rotation in a summer internship.

anyone who has done this, what can i expect from my first day? first month? first year? from the experience in general?
>>
This is your last chance to get good sleep for the next several years and you're going to blow it taking questions from memesters? Go to bed idiot.
>>
>>8196639
you're scaring me
>>
>>8196643
Be scared. You picked the hardest class to play as in this shit videogame no one even beta tested.

Get some sleep. Remove 4chan and any other deconstructive webforums from your bookmarks. Now is the time to grind for XP.

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>>
wtf i hate thomas edison now!
>>
>>8197024
fucking fag
>>
>>8196034
>he was too busy inventing a sexbot
FTFY

File: robots.png (47 KB, 955x589) Image search: [iqdb] [SauceNao] [Google]
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Do you fear automatization?
>>
>>8195880
Its just a continuation of the mechanization that's been happening for hundreds of years.
>>
automation/"robots taking jobs" is literally the best thing that can happen to humanity

the sooner all these trivial tasks are automated the better
>>
all progress is caused by increasing worker productivity
aka
automation

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Has there been any psychological study on music with relation to cognitive abilities while one learns?

In short, do you feel like learning but you learn nothing when you work with music on?
>>
>>8194987

Yes, anon.
>>
>>8194987
Depends on my frame of mind. Because human logic is largely binary, but can recognize the absence of either state, one of three things happens.
-The music adds to what I'm doing and directs thought accordingly, or creates such that the logical framework I'm forming in working memory, or whatever region, is readily tied and integrated with already existing frameworks in long term storage. It gets sorted better later, and is more fluidly retained.
-The music becomes background noise. It doesn't seems...
>>
>>8194987
Bump

Let's talk about computablity and complexity theory.

Beginner: Go to http://rajk.me/static/busybeaver.html, toggle instructions, and find the 2-state Busy Beaver (start with 1-state).

Advanced: Recently Stephen Wolfram's 2-state 3-symbol Turing machine was proved to be universal. Does a 2-state 2-symbol one exist? Additionally, Wolfram's machine is not a decider; it never halts. What's the smallest universal Turing machine that does halt?
>>
>>8194524
Nice riced desktop dude how many chicks has that gotten you
>>
>>8194533
Not as many as you might think. I should start hanging out in coffeeshops more often.
>>
no one /compsci/ here?

File: IQ over time.png (341 KB, 618x853) Image search: [iqdb] [SauceNao] [Google]
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Aren't you guys worried about the western open border policy fucking up humanity last hope for greatness ?
>>
>>8199010
We still have Eastern Europe and China.
>>
>>8199010
Intelligent individuals still select intelligent partners.

/pol/ doesn't understand that all the evil (((media))) and border policy in the world won't make intelligent men/women pick partners two or more standard deviations of intelligence beneath them. The people that pair up willingly with those sorts of people weren't doing your gene pool any favors, anyway.
>>
This is a good thing.

Why?

Because it will cause implementation of eugenics and reproduction laws.

Also graphene.

File: global-bullshit.jpg (139 KB, 800x872) Image search: [iqdb] [SauceNao] [Google]
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Ok, so... Global warming.

Changes in climate really do occur, but are the reasons for it really as global warming theory says?
Because to me 99.999% of the shit said for Global warming seems so stupid that it can not possibly be true. Can it?

So my question is: Is this just an unproven, fallacious theory or is it actually true?
>>
>>8197069
they do occur.
currently, we're warming up.
human activity is in all likelihood speeding the process.

there's more to this (co2 levels and such, effect of warming on humans, etc), but this is more or less the gist of it. global warming activists are arguing that we should exploit cleaner energy to lessen our impact on the warming. i agree, but not necessarily because i care about the warming; i see it as a chance for more awesome technology. because, you know "burning shit" doesn't...
>>
>>8197070
forgot to add: the amount of human "help" to global warming should really be, if anything, at the center of the debate. scientifically, this is the case; politically, not so much. people tend to deny that the climate is changing at all, but then again, much of the same public would probably also agree that the earth is 6k years old, so yeah. democracy.
>>
>>8197070
>www . friendsofscience.org/index.php?id=3
debunks global warming theory completely and on top of that it has evidence for every piece of info provided.
things like this are the reason why I have trouble understanding if global warming is just a fallacious theory or if its actually true.

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What's the consensus on whether or not it will ever be possible to transfer a human consciousness into a new carrier - either by somehow 'uploading' it to a computer (either with or without a robotic body) or by transferring the brain into a new body?
>>
>Consensus
>2000+ year old philosophical dilemmas
Lol.

You're also muddling a number of topics together.
>>
>>8194775
Uploading will never, ever happen. It just doesn't even make sense when you think about how neurons work.

Brain transfer might happen, though. I think they're supposed to attempt a head transplant next year in Italy on some paralyzed Russian electrician.
>>
>>8194776
>philosophy
>producing anything useful
>ever
It's a field that's better left ignored.

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