Amusing Science

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Fid
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Re: Amusing Science

Post by Fid »

Perhaps the authors could explain how teen girls popping gum such that it sounds like frying bacon could possibly power an entire train.
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Witness
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Re: Amusing Science

Post by Witness »

Image
I recently had a full head MRI. Using free software I was able to pluck my brain out and turn it into a desk light.

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Fid
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Re: Amusing Science

Post by Fid »

God friggin' damn, next time I get a half million dollars to spare I'm so gonna do that.
... The stars were suns, but so far away they were just little points of light ... The scale of the universe suddenly opened up to me. It was a kind of religious experience. There was a magnificence to it, a grandeur, a scale which has never left me. Never ever left me.
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robinson
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Re: Amusing Science

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Witness wrote:
Sat Jan 25, 2020 12:45 am
https://www.discovermagazine.com/the-sc ... heir-field for the (not very surprising) details.
I think it was Planck that said science advances one funeral at a time. But my memory is faulty and I don't feel like looking it up. I also didn't read the link before posting this. (but I would bet it doesn't contain the quote)
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robinson
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Re: Amusing Science

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https://www.bloomberg.com/news/articles ... -proves-it

OK they mentioned Planck, but it turns out he never actually said what they said he said about them. What his thoughts on this were are actually more interesting. But not that amusing, so wrong topic.
♪ ♫ ♩ ♬ "

"Science and Mother Nature are in a marriage where Science is always surprised to come home and find Mother Nature blowing the neighbor."

♪ ♫ ♩ ♬

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robinson
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Re: Amusing Science

Post by robinson »

Goddamn that is a fucked up sentence. But again. too lazy to fix it.
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"Science and Mother Nature are in a marriage where Science is always surprised to come home and find Mother Nature blowing the neighbor."

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Witness
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Re: Amusing Science

Post by Witness »

Design your next tattoo:


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Anaxagoras
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Re: Amusing Science

Post by Anaxagoras »

There's a lot of stuff here that I found hard to follow, but it is interesting.

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Re: Amusing Science

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Image
♪ ♫ ♩ ♬ "

"Science and Mother Nature are in a marriage where Science is always surprised to come home and find Mother Nature blowing the neighbor."

♪ ♫ ♩ ♬

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Witness
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Re: Amusing Science

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↑↑ It is not so surprising that the logistic iteration is related to the Mandelbrot set/fractal: a simple affine substitution can convert rx(1-x) to z2+c, so they are basically the same, one being of course on a segment and the other in the full complex plane. (Just write x=az+b and solve for a and b to get the desired form.)

Fifteen years ago (!) I looked into that a bit and came up with this graphic:

Image

Can you spot the differences? I'll explain if somebody's interested.


The Feigenbaum constant is a very nice result. But what really blows my mind, to use that tired expression, is Sharkovskii's theorem or, as Wikipedia puts it:
One of the implications of the theorem is that if a discrete dynamical system on the real line has a periodic point of period 3, then it must have periodic points of every other period.
"Discrete dynamical system" is just an iteration like the logistic. "Periodic point" means the iteration gets back to that value.

So if you have period 3, i. e. f(f(f(x)))=x if f is the iteration formula, you have points/numbers with any other period.

It is often formulated as "period 3 implies chaos", see the Wiki page. :mrgreen:

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Abdul Alhazred
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Re: Amusing Science

Post by Abdul Alhazred »

Something about your bifurcations looking fuzzy. Please elaborate. 8)
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Re: Amusing Science

Post by Witness »

Differences, plural: there's another one. :)

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Re: Amusing Science

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Trifurcations, not bifurcations.
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Witness
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Re: Amusing Science

Post by Witness »

↑ Yep. I'll come back to that, have to dig out my old code.





Image

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Re: Amusing Science

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Re: Amusing Science

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let me help, witness

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Abdul Alhazred
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Re: Amusing Science

Post by Abdul Alhazred »

A duet for helium and sulfur hexafluoride :coolspecs:

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Witness
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Re: Amusing Science

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Anaxagoras
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Re: Amusing Science

Post by Anaxagoras »

That's a technique they used in The Matrix.

A fool thinks himself to be wise, but a wise man knows himself to be a fool.
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Pyrrho
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Re: Amusing Science

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https://www.thisiscolossal.com/2020/02/ ... cellphone/
Justine Haupt, a developer of astronomy instrumentation at Brookhaven National Laboratory, spent the last three years developing a device that strips away all of the non-phone functions of modern smartphones. The Portable Wireless Electronic Digital Rotary Telephone (aka Rotary Cellphone) does not have a touchscreen, menus, or other superfluous features. It fits in Haupt’s pocket, and it makes calls.
Image

http://justine-haupt.com/rotarycellphone/index.html
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