Non Abelian anyon Updated 2025-07-16
Exotic and hard to find experimentally.
Video 1.
Topological quantum computation by Jason Alicea (2021)
Source.
Colony (biology) Updated 2025-07-16
It is hard to distinguish between colonies of unicellular organism and multicellular organism as there is a continuum between both depending on how well integrated they cells are.
GNU Privacy Guard Updated 2025-07-16
Generate public private key, test encrypt and test decrypt:
# Create your pubkey.
gpg --gen-key
gpg --armor --output pubkey.gpg --export <myemail>

# Encrypt using someone's pubkey.
gpg --import pubkey2.gpg
echo 'hello world' > hello.txt
gpg --output hello.txt.gpg --encrypt --recipient <other-email> hello.txt

# Double check it is not plaintext in the encrypted message.
grep hello hello.txt.gpg

# Decrypt.
gpg --output hello.decrypt.txt --decrypt --recipient <myemail> hello.txt.gpg
diff -u hello.decrypt.txt hello.txt
Stack Exchange Updated 2025-07-16
Waste of time sub-sites that should instead be merged into Stack Overflow as different tags.
Nowhere is this waste more visible than at: cs50.stackexchange.com/. A website just for some specific course that is completely covered by other sites of the network? What a humongous waste!!!
Rubik's Cube solution Updated 2025-07-16
Video 1.
The algorithmic trick that solves Rubik's Cubes and breaks ciphers by polylog (2022)
Source. Talks about the Meet-in-the-middle algorithm.
Stern-Gerlach experiment Updated 2025-07-16
Originally done with (neutral) silver atoms in 1921, but even clearer theoretically was the hydrogen reproduction in 1927 by T. E. Phipps and J. B. Taylor.
Video 1.
The Stern-Gerlach Experiment by Educational Services, Inc (1967)
Source. Featuring MIT Professor Jerrold R. Zacharias. Amazing experimental setup demonstration, he takes apart much of the experiment to show what's going on.
Compton scattering Updated 2025-07-16
Classic theory predicts that the output frequency must be the same as the input one since the electromagnetic wave makes the electron vibrate with same frequency as itself, which then irradiates further waves.
The formula is exactly that of two relativistic billiard balls colliding.
Therefore this is evidence that photons exist and have momentum.
Video 2.
L3.3 Compton Scattering by Barton Zwiebach (2017)
Source.
Corollary Updated 2025-07-16
An easy to prove theorem that follows from a harder to prove theorem.
Steve Jobs Updated 2025-07-16
Co-founder of Apple.
Is Jobs evil? Is he interesting? Undoubtedly.
Good quotes:
Car Updated 2025-07-16
Carbohydrate Updated 2025-07-16
Carbonate Updated 2025-07-16
EdX Updated 2025-07-16
As of 2022:
  • can't see course material before start date. Once archived, you can see it but requires login...
  • on free mode, limited course access
Fuck that.
Also, they have an ICP.
November 2023 course search:
Strange Tales from a Chinese Studio Updated 2025-07-16
Big collection of a bunch of ghost stories. 90% of them involve some dude dating a beautiful ghost woman or animal that can shapeshift as a woman.
Organized into 12 chapeters as seen on the Chinese wiki: zh.wikipedia.org/wiki/聊齋志異#章節
Figure 1.
1935 edition of Strange Tales from a Chinese Studio
. Source.

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