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Archived threads in /sci/ - Science & Math - 2125. page

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Hi /sci/. Is there any way a floating island could be built given our current scientific and engineering knowledge?
23 posts and 7 images submitted.
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Possibly. But it would take a lot of time, a lot of work, and a lot of resources.
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>>7686782
Yes. But the expenses and the degree of organization needed to pull of its construction far surpasses anything we've ever built.

And to what end? So that we can have a floating castle city in the sky? No advantage in doing so.
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>>7686787
>>7686788
True I get that, this is all just hypothetical.

How could it actually work? Big rockets and duct tape?

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when we take derivative of e^(x^2+x), we treat x^2+x as a function.

But how can you take derivative of x^4 using chain rule?

It becomes zero, why? (4x^3)*0 (zero is the derivative of 4)

--------------------------

Also, is this the true statement for taking derivative of sinx using chain rule?

(1*sinx^0)*(cosx)*(1) (1 comes from the derivative of x)
38 posts and 3 images submitted.
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Is there anything more disappointing than coming here and seeing people posting high school math shit?
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I'm not sure about this but I guess it has something to do with the chain rule. (https://en.wikipedia.org/wiki/Chain_rule)

When you want to differentiate your first function you're actually substituting the function in the exponential by a new function (let's call it u(x)) so now your derivative becomes:
f(x)=exp(x^2+x), u(x)=x^2+x
df(x)/dx=df/du*du/dx

In your second function there is no function of x to substitute in your exponential. Therefore the derivative becomes 4*x^3.
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>>7686733
Wrong. There is the function u(x) = 4.

The point is that you'd be differentiating something of the form x^{u(x)} which is quite different from an exponential, or a polynomial. So you'd have
[math]y = x^{u(x)}[/math] gives [math]y'/y = (u(x)\log(x))'[/math].

I'll let you work out the details to check it all works.

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Is it possible to solve this limit without using L'hopital? I know how to solve senx/x but those "e" screw me up.
17 posts and 2 images submitted.
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prob has to do with using hyperbolic trig identities on the denominator i don't fuggin know
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http://www.wolframalpha.com/input/?i=limit+as+x+approaches+0+of+x+sin+%282x%29+%2F+%28e%5Ex+%2B+e%5E-2+%2B2%29
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>>7686637
0sin(2(0))/(1+1-2)=0

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Dear /sci/, I propose that lipid membranes do not exist. Here is some of my reasoning:

http://jp.physoc.org/content/280/1/105.short
>Cutting a cell in half and exposing the cut face to a solution of sodium and potassium does not change solute concentrations significantly

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1072717/pdf/jcinvest00750-0067.pdf
>Rubidium replaces potassium within a cell. Cesium replaces both. If potassium is accumulated due to an inward pumping, other solutes should not affect this.

http://www.gilbertling.org/PCP40_ling_ochsenfeld.pdf
>Under the right conditions, protein can accumulate potassium and exclude sodium without requiring a lipid membrane or pumps
25 posts and 1 images submitted.
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>>7686589
WAT ARE MICELLES
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>>7686605
What is your point? or are you just spouting buzzwords?
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I propose you should stop posting the same thing
>here is experimental evidence against the membrane-pump theory for the maintenance of high K+ and low Na+ concentrations in resting cells. Ling has shown (1962) that under specified conditions, the Na pump alone would consume 1530 times the total energy available to the cell.
>This objection to the steady-state model, presented in detail fifteen years ago (Ling, 1962), has been confirmed in general principle by Jones (1965) and Minkoff & Damadian (1973, 1974). A second example of experimental evidence against the pump model consists of the demonstration that the levels of Na+ and K+ in the cell do not depend on the rate of outward Na+ flux, as demanded by the pump theory (Ling & Ochsenfeld, 1976).
what we know now, which we didn't know then, is that Na+/K+ ion flow is facilitated by using opposite concentration gradients, that Na+ pumps do not move solely Na+, and that cells also have general-purpose ion diffusion pores. all of those are theoretical details which have been well documented and demonstrated in the decades since this paper came out

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>The worry is that changing the DNA of the next generation is unsafe and a slippery slope toward eugenics. Yet many of the scientists attending the Washington meeting won’t be there to ban the technology, but to trade tips about how, exactly, they might be able to do it right.

>One scientist who thinks he knows is Jinsong Li, a biologist at the Shanghai Institutes for Biological Sciences. Earlier this year, Li managed to use CRISPR to edit a gene that causes eye cataracts in mice, creating healthy newborn animals with “100 percent” success.

>The way Li’s team did it was to avoid embryos, and instead edit “spermatogonial” stem cells growing in his lab. These are the factory cells that make sperm. By gene editing mouse sperm cells first, and then using corrected sperm to make embryos, Li’s mice came out perfect every time.

Source: http://www.technologyreview.com/news/543541/how-to-really-engineer-a-human-baby/

So editing embryos is out, editing sperm cells is in. This is the future of human gene editing.
16 posts and 2 images submitted.
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>>7686436
>So editing embryos is out, editing sperm cells is in. This is the future of human gene editing.

What about defects that are in the egg cells?
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>>7686439
Use a "healthy" mother I guess I don't know desu.
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>>7686439
There is a 50/50 chance that a defective gene from an egg will be passed on, I think. So create embryos until one doesn't have that gene. That doesn't require gene editing, only gene screening.

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http://gender.stanford.edu/news/2014/why-does-john-get-stem-job-rather-jennifer

Science isn't that objective now, is it?
11 posts and 4 images submitted.
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>mathematics not even it's own category
>trash man meme
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Women don't go into some fields, whereas men do.
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>>7686465
What does that have to do with anything?

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How can something collapse in on itself and still produce an immense gravitational pull?
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>>7686275
Okay so the mass equivalence of a photon with a wavelength of 589nm is 3.75*10^(-36) kg.

I imagine that something with the density of a black hole pulls in shittons of those.

Answering the question: BECAUSE IT'S SO FUCKING DENSE.
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>>7686275
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It is called singularity for a reason.
We simply don't know what happens inside a black hole.

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Why don't electrical appliances have two sockets in order to create a circuit?
like pic related
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>>7686272
Is this bait?
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>>7686272
A single socket already creates a circuit. The input and output wires are contained within one cable, this is why sockets have two prongs (and sometimes a third for grounding).
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>>7686272
>bundle the wires
>put the sockets closer togheter (pic related)

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what if humans are raised for a specific reason?
15 posts and 3 images submitted.
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Why did you make this thread?

This isn't even science fiction, it's a basic question we've been asking for nearly as we've existed and recorded our history.

Yeah, what if? What if man?! WHAT IF WHAT IF?

DUNNO MAN. WHY DON'T YOU GO THINK ABOUT IT ON YOUR OWN FOR A WHILE?
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>>7686219
Then you'd have to tackle most of modern science's biggest philosophical issues: The question of Final Causality.

If Final Causality exists then humanity has a "reason" and if not, they don't.
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Yeah. Actually, you are right. Sorry for ruining your day. But you almost broke my heart.

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How do you train your brains? I mean exercises and whatnot. Currently i'm playing this BrainWars apps but can't tell if increasing scores may have any influence on daily activities. Do you maybe know any better free apps for android?
13 posts and 1 images submitted.
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Brain training games don't help you in general. They help you become good at those specific games. The only proven brain training technique is N back tests.
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Jigsaws. Helps you recognise patterns and visualise future outcomes.
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>>7686046
Reading books and learning science and mathematics will do more than anything else.

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Why is gene therapy theortically sound but realistically impossible?
16 posts and 2 images submitted.
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>>768592
I need answers
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>>7685920
Cause what if the patients don't like jeans? You would have to have khaki therapy, pants therapy, skirt therapy etc.
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its relatively easy to accidentally give the patient cancer

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Couldn't one simply grow a superintelligent mind by growing neurons in a large enough vat with a built-in vascular network to bring in nutrients and oxygen and remove carbon dioxide?

Brain tumors are made up of neurons or glial cells and they replicate very well:

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

And they can already grow tiny brains with all the right specialized tissues in labs:

http://www.theguardian.com/science/2015/aug/18/first-almost-fully-formed-human-brain-grown-in-lab-researchers-claim

The researchers above claim that its difficult to grow brains any bigger without a vascular network. However, blood vessels have been successfully made from stem cells:

http://www.medicaldaily.com/new-blood-vessel-grows-1-week-when-using-stem-cells-2-tablespoons-blood-307941

And two-way transmission of electrical signals between neurons and computer chips have been shown to work as well which should provide the "super-brain" with efferent and afferent processes as well as a way to receive and send out information:

http://news.discovery.com/tech/computer-chips-nerve-cells-110321.htm

Put all of these together and a superintelligent brain grown in a lab should be possible, no?

And if superintelligence is possible then the Singularity as predicted by Kurzweil and Vinge should be possible today as well, right?
33 posts and 3 images submitted.
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>>7685820
What singularity? You mean a black hole? How does that tie in with artificial brain material.
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>>7685820
I am a monument for all your sins
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>brain size =/= intelligence

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slowly accelerate subject to significant percentage of light speed with acceptable g force

there's no reason why this can't be done

much more feasible than space travel because you don't have to worry about fuel
12 posts and 1 images submitted.
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How do you plan on gathering enough energy for that thing?
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the force that the wall would have to exert on your body to keep you in that shit "time machine" would kill you
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>>7685771
what force? you are accelerating it slowly so the person will live

at constant speed the person won't know it's spinning

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Does anyone else feel that genetics and especially molecular genetics as a field has become a failure?

Looking at the progress we made between the early 80s and late 90s, you'd think that we'd be living in a Gattaca-esque society by now.

In the 80s, we had the first PCR machines, Sanger sequencing, and sequencing of the first non-human genomes.

In the 90s, we had the first cloned mammals, then the first cloned large human-like mammal (Dolly), the first DNA microarrays, the Human Genome Project was in full swing, the first genetically modified foods were appearing in the market, DNA fingerprinting was being introduced in courts to solve crimes and paternity disputes for the first time, etc.

Fast forward to today and it appears that cloning has gotten us nowhere. The state of cloning is still roughly the same as it was 10 or 15 years ago (i.e. 200+ failed embryos are required to make one successful embryo with many "successful" embryos dying in utero or shortly after birth). There has also been a backlash against GM foods with many consumers rejecting them altogether.

We believed that finishing the Human Genome Project would give us insights into the way our bodies work as well as treatments for various diseases. Instead what we have is a whole bunch of data that we don't know what to do with and still know very little about (and this isn't something that even a 1 cent genome could fix: while sequencing costs have dramatically fallen - our knowledge of the genome has been increasingly at a snail's pace. Without this knowledge, all the data in the world is pretty much useless).

Gene therapy was supposed to be the next big thing. Yet in several highly publicized cases, gene therapy ended up killing the people it was meant to treat.
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>>7685741
>field requiring human experimentation have a hard time advancing in our ethics madness world
STOP THE PRESSES
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I feel it has become a failure in that it can be used to promote racism. We live in a gattaca-esque society but not to those extremes. Eugenics is a big part of our diet. I remember one of my Jewish teachers whose parents suffered in Germany because of their very dark skin always used to accuse Gerber of promoting racial inequality; comparable to Nazi Germany. When I was little, I had abs and was pretty buff, naturally. So we would go to places and people would start praising it. My mother hated it. She saw it as wrong for society to treat people different because of their appearance rather than smarts. It is something very malicious from a social standard because it incubates a world where one must be strong and be feared rather than loved. A brutal world that was still reverberating the ideals of the cruelty that had transpired several decades earlier. In genetics some people are born gifted. It is said that some people are able to control junk dna, which stores familiar traits a bring them from the background to the foreground. As to how this happens no one knows exactly but it happens to many as they get older. As for cloning, I remember meeting someone who kept up to date with military ideas whether ethical or not, however was still seen as important to discuss. They had this fear of cloning and how it would be used by armies around the world to create the perfect soldier. I remember we went to go see the movie the Impostor back in 2001 and they left the theatre; once he had grasped onto the premise of the film. It was not a concept many people liked nor do they like today. It is a common trend that advanced sciences are usually exploited for wars.
The human genome project was one of those things that went celebrated and kids often had to do reports on it depicting their ideas. However it came with disclaimers all around it. And this is particularly what makes genetics a failure.
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>>7685766
People do not want to exceed a certain point nor create an unnatural way of life. Sure people enjoy the idea of structure in their living. But chaos is always the homeliest.

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When the treaty preventing Antarctic development expires in 2050 I expect there will be some attempts to properly settle it by Russia at least

What technologies would it require to build a stable, safe city on top of ice, to power it and keep shit from freezing? Would you want to live someplace with a remarkable view, but where it is difficult/dangerous to go outdoors? Assume the interiors of the buildings are all super attractive and cozy.
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yeah
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>>7685732
With global warming in full swing by them some of it might become Svalbard-tier
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>>7685732
No government will let it happen because people will discover the truth about the Earth's shape.

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