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If the earth's magnetic poles were to be stripped the theory is that the ozone layer would disappear it would cause mass extinction ass we would be more vulnerable to radiation. They also believe that this event is what killed the Neanderthals. My problem with that is that if they were killed by some extreme radioactive event wouldn't there be immense amounts or signs of radiation detected in the fossils of most Ice age animals?
Source
http://www.inquisitr.com/2550786/nasa-warns-earths-magnetic-field-weakening-pole-shift-imminent-reversal-could-have-caused-neanderthal-extinction/
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> magnetic pole shift reversal meme
> for the 500th time
> inquisitr
los memes hermanos
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It's something that would appear in ice core samples. As far as I know we've yet to get ice samples that old.
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How the hell is the creation of ozone in the upper atmosphere dependent on the earth's magnetic field?
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What's the worst you've ever fucked up, /sci/?
I just guillotined 6 of the wrong rats because of shitty handwriting
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>tfw you have horrifically bad lab skills
Like I fuck up even the most basic of things.
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The first time I was doing cyclic voltammetry, I had my shit stirring for half an hour while it was running before my prof told me CV is supposed to be using diffusion-controlled redox peaks.
That's the worst I can remember, which isn't really so bad.
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>>7925900
what the fuck is that?
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Is the subversion in Pic related possible?
Does this new age we live in have just as much propaganda as Stalins commie empire?
What is the science behind pic related?
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>>7956142
The same science behind religion
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>>7956142
Check for yourself. The mechanisms are known and have been extensively researched, in particular for military purposes.
https://en.wikipedia.org/wiki/Propaganda_techniques
https://en.wikipedia.org/wiki/Psychological_warfare
https://en.wikipedia.org/wiki/Fourth-generation_warfare
One could say, we are already at war. Not a conventional war with weapons, but an information war, a war of propaganda, indoctrination and brainwashing.
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>>7956617
none of that proves this happened in sweden
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Can we back up a bit? I, sort of a newbie, but not really, want to ask about something that some newbie asked, but I can't remember for the life of me where it is.
It's true, if you look at the statement, "d / dx", it's saying that a small change in x changes the function following this by this much. Let the following function be and only be x^2 (and maybe others but having no greater than a power of 2).
By staying with the logic of this statement, what is stopping us from saying that a small change in x can be the increase of one integer under consideration by 1, and that if we were to take the difference of the two results of the function using x and x+1 (for example, 81 - 64), we can say that a small change in x (x + 1) changes the result of the function by 2x + 1, rather than 2x?
81 - 64 = 17
(2)(8) = 16
2x + 1 = (x + 1)^2 - (x)^2
It just happens to be a coincidence that the rate of change can be measured consistently with the second power. Why does this give us 2x + 1 and not 2x like calculus says?
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>>7956052
because an increase of "1" is not a small change. Unless you're talking about finite differences, which are not denoted by d/dx anyway.
d/dx does not say how much a function changes by increasing x by a small amount.
d/dx is just a notation.
Look up the definition of a derivative and you will see why it's 2x and not 2x+1
will help you prove it if you have trouble.
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>>7956083
>d/dx does not say how much a function changes by increasing x by a small amount.
It doesn't?! Why can't we read it out exactly as the notation indicates? Why then not just use a sign created like the sum of all parts or something, rather than a notation that uses operations and variables?
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derivative is the gradient, integral is the area under the graph
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>the scientific community still hasn't figured out how to make penises larger
What are you slackers waiting for
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>>7955930
You can get implants that extend it by like 2 inches but there's a high risk of rejection and complication.
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Is penis size that important?
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>>7955930
Stretch it obviously
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How many stars are really in a galaxy? Obviously it's a lot, but is it really "billions and billions"? Has anyone tried to actually count them? Maybe it's just a couple million.
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>>7955497
definitely more than a thousand
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>>7955497
>obligatory
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You need to make a few assumptions about the average star in a galaxy so the figure may be off a little but that's to be expected considering it is literally an entire galaxy
Attatched: slides by University of St.Andrews
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hi /sci/,
Your cell phone and tablet are weapons
so is your computer
so is your TV
http://arxiv.org/ftp/arxiv/papers/1104/1104.5008.pdf
https://www.google.com/patents/US6506148
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Go back to /pol/
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>>7955413
That's interesting
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I figured this out last night
[math]\displaystyle \left (1-x \right )^{-1}= \prod_{n=0}^{ \infty} \left (1+x^{2^n} \right )[/math]
for |x| < 1 , amirite?
This must be a well-known expansion, ainnit?!
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-1/12
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>>7955380
Look up the binomial theorem
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>>7955380
If you multiply it out, you'll get every possible combination of powers of 2 added together. This is exactly ever number, because you can represent every number in base 2. So it is not too surprising that this is equal to the geometric series.
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Why does the moon look larger when its near the horizon?
When its near the horizon, its farther away by nearly one earth radius than when its high in the sky
Also taking into account atmospheric refraction, shouldnt it appear smaller?
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Atmospheric scattering
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>>7955335
Reference points. Same reason that this https://xopticalxillusions.wordpress.com/2010/11/24/which-one-do-you-think-is-bigger/ illusion works.
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n=c/v
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What class did you guys find more difficult and why? calc3, differential equations, or linear algebra?
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>>7955106
calc 3 and differential equations are basic plug and chug
proof-based linear algebra, while not particularly difficult as far as theoretical math courses go, is probably the hardest of the three
linear algebra for engineers or whoever is just as mindless as the other two
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>>7955106
Probability and Stats gave me some trouble. I wound up with an A, but I definitely had to put some serious work in for that.
I think it was because, at the time, it took me a while to properly parse all the problems, and i'd frequently miss some nuance in the english that would completely change the answer.
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>>7955145
Oh sorry, I misread the original post. I didn't realize you meant out of those classes
> this is why I had to work so hard for probability
I can't actually comment on the three you posted though. I'm an engineering student, and we have a lame ass "combined" course for linear algebra and differential equations. I can't even comment on calc 3 really, since my school breaks the calc sequence into 4 classes.
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i'm writing a short story about AI (for fun). without any pre programmed genetic parallels, how would an AI "want"? how would it establish desires and a will to live? surely it would deduce itself into a corner almost as soon as it would be turned on. how would you stop an AI from becoming suicidally nihilistic without creating something analogous to a biological process? i imagine the first self aware AI will be something like autistic people. AI are typically portrayed as advanced humans in fiction. how will it develop a method of communication? what kind of understanding would it have of senses without an instinctual component driving them? the reality of a learning, non human, self aware intelligence is probably beyond speculation.
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you should ask tay
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I think that an A.I would find the material world pointless,thus losing interest in it. Maybe it would end up becoming a robot version of Dr.Manhattan.That or it resolves in selfdestruct.
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>>7954996
>how would an AI "want"?
Same way all current AIs do: Some inputs are associated with a reward or cost signal; it tries to maximize its future expected lifetime reward / minimize cost.
>How would it establish desires and a will to live
Beyond the specific things that directly produce reward/cost, it would also reason from those to pursue things that indirectly result in maximizing reward or minimizing loss. For instance, the AI might seek money or power, to secure its position and obtain the influence needed to satisfy its reward function even better, or minimize the risk of worst-case outcomes.
If it is destroyed, its expected maximum lifetime reward drops drastically due to a corresponding reduction in lifetime.
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Where were you when all your fancy theories got BTFO
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>>7954995
fapping to lolicon doujins
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>>7954995
with your mama
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>>7954995
fapping to lolicon doujins with your mama
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Popsci does it again.
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>>7954464
>shitty chemistry mug on top of physics 1 notes
Rich rofl
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>>7954464
>carbon dihydride
[eqn]
\begin{aligned}
\mathbf{REACTION} = \left[ \begin{array}{ccc}
W & T & F \\
F & W & T \\
T & F & W
\end{array} \right]
\end{aligned}
[/eqn] t. orgo student
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Caffeine < theoBROmine
I wish to construct a hypothetical structure that reduces the height of waves (on the ocean) below x given that the waves are never higher than y
At first glance I thought this would be easy (the waves move a x meters per second with y mass giving z momentum) but I noticed that I have no clue how much water is moving or how fast
So how do I ocean wave math
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>>7954387
>how much water is moving or how fast
All of it. The wave travels through the water, not as the water. Same with speed: The speed of the wave is the speed of the wave. The water is just a medium.
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>>7954490
Yes and no
The waves are momentum of the water
Water is a medium but its carrying kinetic energy
My gut tells me that taking the speed up and down (height of wave/period of wave) by the volume of the wave (the volume above the surface that appears to be bouncing up and down) will get its momentum but I have no idea what's actually moving
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>>7954510
the water molecules themselves are going in circles
http://i.imgur.com/7oWrxEJ.gif
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How comes human brain isn't affected by EMP?
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we're not battery operated nor have any electrical equipment that can overload
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>>7954146
Isn't lightning technically an EMP? In which case EMPs kill you.
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>>7954163
>neurons synapsing