Perturbation theory Updated 2025-07-16
Used a lot in quantum mechanics, where the equations are really hard to solve. There's even a dedicated wiki page for it: en.wikipedia.org/wiki/Perturbation_theory_(quantum_mechanics). Notably, Feynman diagrams are a way to represent perturbation calculations in quantum field theory.
Phaser hello world Updated 2025-07-16
- phaser/hello.html: a minimal hello world adapted from web.archive.org/web/20230323212804/https://phaser.io/tutorials/getting-started-phaser3/part5. Not an actual game strictly speaking though, just shows the phaser logo bouncing around the screen.
- phaser/hello-game.html: an actually hello world game where you have to collect stars and avoid bombs.Based on labs.phaser.io/index.html?dir=games/firstgame/&q=:
- finished version: labs.phaser.io/view.html?src=src/games/firstgame/part10.js
- corresponding tutorial: web.archive.org/web/20230323210501/https://phaser.io/tutorials/making-your-first-phaser-3-game/part10.
Braindumping Updated 2025-07-16
There are two ways:
- manually dumping your brain on media such as notebooks, wikis or videos, i.e. forming a personal knowledge base
- technically using sensors for brain scanning
Brain in a vat Updated 2025-07-16
BrainSimII Updated 2025-07-16
Circuit-based quantum computer Updated 2025-07-16
Fabless semiconductor company Updated 2025-07-16
CIA 2010 covert communication websites Breakthroughs Updated 2025-07-16
Some less-trivial breakthroughs:
- finding 2013 DNS Census
- CGI comms characterization
- secure subdomain search on 2013 DNS Census let to a few hits
- 2013 DNS Census virtual host cleanup heuristic keyword searches was massive and led to many new ranges
Bitcoin inscription bibliography Updated 2025-07-16
Bitcoin IRC channel Updated 2025-07-16
A lot of important development discussion happened in those channels: en.bitcoin.it/wiki/IRC_channels
At www.reddit.com/r/Bitcoin/comments/5pvp6m/is_there_a_log_for_the_bitcoin_irc_channel/ "Is there a log for the bitcoin IRC channel?" Luke Dashjr comments:User "midmagic" (TODO identify) then comments:
No, it is meant to be private without logging allowed.
Some IRC logs were dumped into the Bitcoin blockchain at: IRC log dumps where they cannot be deleted.
Bitcoin RPC command Updated 2025-07-16
These are commands that e.g. the Bitcoin CLI client can make to the server.
The commands can be listed with:and full help with:
bitcoin-core.cli helpbitcoin-core.cli help getrawtransactionFor example. to run the Bitcoin and then on another shell:
getrawtransaction command, first in one shell we start bitcoind:bitcoin-core.daemonbitcoin-core.cli getrawtransaction 75b431e0a8c4617ca8adefe593ba66aa30907742b6dc8772761bfe7edabd74b4 true Bitcoin script Updated 2025-07-16
BitcoinStrings.com Updated 2025-07-16
bitcoinstrings.com has all
strings -n20 strings, we can obtain the whole thing and clean it up a bit with:wget -O all.html https://bitcoinstrings.com/all
cp all.html all-recode.html
recode html..ascii all-recode.html
awk '!seen[$0]++' all-recode.html > all-uniq.htmlawk to skip the gazillion "mined by message" repeats.A lot of in that website stuff appears to be cut up at the 20 mark. As shown in Force of Will, this is possibly because they didn't use
-w in strings -n20, and the text after the newlines was less than 20 characters.That website can be replicated by downloading the Bitcoin blockchain locally, then:
cd .bitcoin/blocks
for f in blk*.dat; do strings -n20 -w $f | awk '!seen[$0]++' > ${f%.dat}.txt; done
tail +n1 *.txtRemove most of the binary crap:
head -n-1 *.txt | grep -e '[. ]' | grep -iv 'mined by' | less bit gold Updated 2025-07-16
Black-body radiation experiment Updated 2025-07-16
- The Quantum Story by Jim Baggott (2011) page 10 mentions:and the footnote comments:
Early examples of such cavities included rather expensive closed cylinders made from porcelain and platinum.
- 1859-60 Gustav Kirchhoff demonstrated that the ratio of emitted to absorbed energy depends only on the frequency of the radiation and the temperature inside the cavity
- 1896 Wien approximation seems to explain existing curves well
- 1900 expriments by Otto Lummer and Ernst Pringsheim show Wien approximation is bad for lower frequencies
- 1900-10-07 Heinrich Rubens visits Planck in Planck's villa in the Berlin suburb of Grünewald and informs him about new experimental he and Ferdinand Kurlbaum obtained, still showing that Wien approximation is bad
- 1900 Planck's law matches Lummer and Pringsheim's experiments well. Planck forced to make the "desperate" postulate that energy is exchanged in quantized lumps. Not clear that light itself is quantized however, he thinks it might be something to do with allowed vibration modes of the atoms of the cavity rather.
- 1900 Rayleigh-Jeans law derived from classical first principles matches Planck's law for low frequencies, but diverges at higher frequencies.
Black-body Radiation Experiment by sciencesolution (2008)
Source. A modern version of the experiment with a PASCO scientific EX-9920 setup. 2017 Nobel Prize in Chemistry Updated 2025-07-16
Cryogenic electron microscopy, which was developed in the 70's.
1973 Nobel Prize in Physics Updated 2025-07-16
Black holes nearest to the Sun Updated 2025-07-16
Interesting to note that there are quite a few nearer than Sagittarius A, as of 2022 we know of one at 1.5 kly: universemagazine.com/en/discovered-the-closest-black-hole-to-the-sun/
It is interesting that a few months earlier there seemed to be no known specific black holes in the Milky Way: www.nasa.gov/feature/goddard/2022/hubble-determines-mass-of-isolated-black-hole-roaming-our-milky-way-galaxy although their count is estimated to be in the hundreds of millions.
Blaise Pascal Updated 2025-07-16
Good film about him: Blaise Pascal (1972).
Good quote from his Les Provinciales (1656-57) Letter XII, p. 227:French version reproduced at: www.dicocitations.com/citation/auteurajout35106.php.
All the efforts of violence cannot weaken truth, but only serve to exalt it the more.When force opposes force, the more powerful destroys the less; when words are opposed to words, those which are true and convincing destroy and scatter those which are vain and false; but violence and truth can do nothing against each other.Yet, let no one imagine that things are equal between them; for there is this final difference, that the course of violence is limited by the ordinance of God, who directs its workings to the glory of the truth, which it attacks; whereas truth subsists eternally, and triumphs finally over its enemies, because it is eternal, and powerful, like God Himself.
Phaser.js Updated 2025-07-16
Likely the best JavaScript 2D game engine as of 2023.Uses Matter.js as a physics engine if enabled. There's also an alternative (in-house?) "arcade" engine: photonstorm.github.io/phaser3-docs/Phaser.Physics.Arcade.ArcadePhysics.html but it appears to be simpler/less robust (but also possibly faster).
- github.com/photonstorm/phaser
- phaser.io/
- phaser.io/examples/v3.85.0/games contains the demo games
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