Two-body problem Updated +Created
youtu.be/Ca7c5B7Js18?t=803 compares Lagrangian mechanics equation vs the direct x/y coordinate equation.
Dragon Ball Updated +Created
Matrix decomposition Updated +Created
Transpose Updated +Created
HTML canvas Updated +Created
Allows us to draw with JavaScript pixel by pixel! Great way to create computational physics demos!
Here is an animation demo with some useful controls:
HTML snippet:
new class extends OurbigbookCanvasDemo {
  init() {
    super.init('hello');
    this.pixel_size_input = this.addInputAfterEnable(
      'Pixel size',
      {
        'min': 1,
        'type': 'number',
        'value': 1,
      }
    );
  }
  draw() {
    var pixel_size = parseInt(this.pixel_size_input.value);
    for (var x = 0; x < this.width; x += pixel_size) {
      for (var y = 0; y < this.height; y += pixel_size) {
        var b = ((1.0 + Math.sin(this.time * Math.PI / 16)) / 2.0);
        this.ctx.fillStyle =
          'rgba(' +
          (x / this.width) * 255 + ',' +
          (y / this.height) * 255 + ',' +
          b * 255 +
          ',255)'
        ;
        this.ctx.fillRect(x, y, pixel_size, pixel_size);
      }
    }
  }
}
Human brain research project Updated +Created
JavaScript language Updated +Created
Pixi.js Updated +Created
Chorus effect Updated +Created
Transmission Control Protocol Updated +Created
Cosmos: A Personal Voyage (1980) Updated +Created
You can feel the marijuana flowing out of this one, it's just great.
100 Greatest Discoveries by the Discovery Channel (2004-2005) Updated +Created
Hosted by Bill Nye.
Physics topics:
biology topics:
  • Leeuwenhoek microscope and the discovery of microorganisms, and how pond water is not dead, but teeming with life. No sample of course.
  • 1831 Robert Brown cell nucleus in plants, and later Theodor Schwann in tadpoles. This prepared the path for the idea that "all cells come from other cells", and the there seemed to be an unifying theme to all life: the precursor to DNA discoveries. Re-enactment, yay.
  • 1971 Carl Woese and the discovery of archaea
Genetics:
Medicine:
  • blood circulation
  • anesthesia
  • X-ray
  • germ theory of disease, with examples from Ignaz Semmelweis and Pasteur
  • 1796 Edward Jenner discovery of vaccination by noticing that cowpox cowpox infected subjects were immune
  • vitamin by observing scurvy and beriberi in sailors, confirmed by Frederick Gowland Hopkins on mice experiments
  • Fleming, Florey and Chain and the discovery of penicillin
  • Prontosil
  • diabetes and insulin
Tinker Tailor Soldier Spy Updated +Created
Some key points that are a bit hard to grasp, at least in some versions:
  • How did Bill Haydon know Jim Prideaux was going to Prague if it appears to be organized as a closely guarded secret by Control?
    • the film suggests Prideaux must have told Haydon himself, his close friend, against Control's orders of secrecy, out of loyalty, and in order to protect his friend.
    • The series suggests it was a honeypot
    so which one is it?
  • How does Smiley deduce that the Witchcraft source, Merlin, is Poliakov? A key step is when top people at the Circus question him about Ricki Tarr, and appear to suggest that there is a link between Ricki Tarr and Merlin. And Ricki told Smiley that Poliakov as the link to the Mole. Smiley understands that it was Karla who tipped off London Center about Ricki's coming through Merlin. He also observers that Witchcraft gives ideological infiltration campaign intelligence after Ricki comes back, as a way to discredit Ricki. It is still all a bit indirect.
Utah Updated +Created
mormon-land.
Video 1.
I Can’t Rescue This Toyota 4Runner! Matt's Off Road Recovery (2022)
Source.
Utah is beautiful! For some reason, Ciro Santilli started to really enjoy watching this channel.
In its essence, it is basically a Monster of the week show, but instead of monsters they fight to remove cars from mud. There's also perhaps a cowboy feel to it.
Other attractions include:
  • the beauty of Utah. What an amazing state!!! Very desertic.
  • a band of recurring superheroes, with unique personalities
  • mini story archs, referring to previous episodes, e.g.
    • the sick dude who keeps getting stuck
    • the day they moved a large rock and the rangers asked them to put it back
Washington (state) Updated +Created
Hyperbolic functions Updated +Created
Crate solid color image in ImageMagick Updated +Created

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