Twisted pair Created 2024-06-26 Updated 2025-07-16
Education of André-Marie Ampère Created 2024-06-26 Updated 2025-07-16
en.wikipedia.org/w/index.php?title=Andr%C3%A9-Marie_Amp%C3%A8re&oldid=1211946256:
Jean-Jacques Ampère, a successful merchant, was an admirer of the philosophy of Jean-Jacques Rousseau, whose theories of education (as outlined in his treatise Émile) were the basis of Ampère's education. Rousseau believed that young boys should avoid formal schooling and pursue instead a "direct education from nature." Ampère's father actualized this ideal by allowing his son to educate himself within the walls of his well-stocked library.
TODO find the source for this.
Electrical cable Created 2024-06-26 Updated 2025-07-16
One more more electrical wires surrounded by an insulator.
Oliver Heaviside Created 2024-06-26 Updated 2025-07-16
He participated in the development of the electrical telegraph, and he did some good modeling work that improved the foundations of the field, notably creating the telegrapher's equations.
He was one of those idealists who just want to do some cool work even if they have to starve for it, people had to get a state pension for him for his contributions. Nice guy. en.wikipedia.org/w/index.php?title=Oliver_Heaviside&oldid=1230097796#Later_years_and_views:
In 1896, FitzGerald and John Perry obtained a civil list pension of £120 per year for Heaviside, who was now living in Devon, and persuaded him to accept it, after he had rejected other charitable offers from the Royal Society.
He also never married: www.nndb.com/people/627/000204015/
Figure 1.
Oliver Heaviside c. 1900
. Source.
We intersect 2013 DNS Census virtual host cleanup with 2013 DNS census MX records and that leaves 460k hits. We did lose a third on the the MX records as of 260 hits since secureserver.net is only used in 1/3 of sites, but we also concentrate 9x, so it may be worth it.
Then we Wayback Machine CDX scanning. it takes about 5 days, but it is manageale.
We did a full Wayback Machine CDX scanning for JAR, SWF and cgi-bin in those, but only found a single new hit:
Coming out Updated 2025-07-16
Company Updated 2025-07-16
Text materials are generally superior to video because they:
  • are faster to create and edit
  • uses less disk space and network bandwidth
  • is easier to search: Ctrl + F on the browser and off you go. And then grep if you have superpowers.
Only produce video material if:
Never create videos of people just speaking hardcore content for long amounts of time.
If you have to use videos, make them as short as possible, and index them with a textual table of contents.
Also consider using sequences of images or GIFs instead of videos, since those are cheaper.
Figure 1.
Textbooks Y U NO HAVE CTRL-F meme
. Source. Same applies to videos.
555 timer IC Updated 2025-07-16
How to teach / Use English Updated 2025-07-16
By writing in English you reach more people.
Writing in any other language is a waste of time.
The reason is simple: English speakers control a huge proportion of the world's GDP.
English is the de-facto Lingua Franca of the second half of the 20th Century, it is the new lingua franca, the new Latin, and there is no escaping it.
Students who don't know English will never do anything truly useful in science and technology. So it is pointless to teach them anything (besides English itself).
Ciro Santilli often sees all those genius who are much smarter than him making shitty forum/mailing list posts, they need to learn this:
  • The apparently most important one liner error message must appear in the title, and fuller apparently relevant logs must appear on the body
  • You must always give the version of the software that you are using as either a tag or git SHA
    These are an important part of the minimal working example.
  • For build errors, you must give your OS and compiler version and version of any relevant external library
HTML canvas Updated 2025-07-16
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);
      }
    }
  }
}
Huainanzi Updated 2025-07-16
De novo DNA synthesis Updated 2025-07-16
As of 2018, Ciro Santilli believes that this could be the next big thing in biology technology.
"De novo" means "starting from scratch", that is: you type the desired sequence into a computer, and the synthesize it.
The "de novo" part is important, because it distinguishes this from the already well solved problem of duplicating DNA from an existing DNA template, which is what all our cells do daily, and which can already be done very efficiently in vitro with polymerase chain reaction.
Notably, the dream of most of those companies is to have a machine that sits on a lab bench, which synthesises whatever you want.
TODO current de novo synthesis costs/time to delivery after ordering a custom sequence.
The initial main applications are likely going to be:
but the real pipe dream is building and bootstraping entire artificial chromosomes
News coverage:
Video 1.
Nuclera eDNA enzymatic de novo DNA synthesis explanatory animation (2021)
Source. The video shows nicely how Nuclera's enzymatic DNA synthesis works:
Feels quite good.
Bought: Paris 2015, about 180 euros.
The model number is 41075.
Label markings:
V78003007 00 LH 11440482
41075 1173 CNU SPINNER 77/2
EXTERIOR: NYLON 56%
POLYESTER 44%
INTERIOR: POLYESTER 100% Made In China (LH)
Wheel hole separation:
  • bottom two: 3.55cm
  • bottom two: 3.4cm
  • bottom to top: 4.3cm
Trying to buy a replacement: www.amazon.co.uk/dp/B08KVZQSTG
Human brain Updated 2025-07-16
Ciro Santilli feels it is not for his generation though, and that is one of the philosophical things that saddens him the most in this world.
On the other hand, Ciro's playing with the Linux kernel and other complex software which no single human can every fully understand cheer him up a bit. But still, the high level view, that we can have...
Figure 1. Source.
  • 1: Ventriculus lateralis, Cornu frontale
  • 2: Ventriculus lateralis, Pars centralis
  • 3: Calcar avis
  • 4: Ventriculus lateralis, Cornu occipitale
  • 5: Trigonum collaterale
  • 6: Eminentia collateralis
  • 7: Hippocampus
  • 8: Ventriculus lateralis, Cornu temporale
  • 9: Capsula interna
  • 10: Nucleus caudatus
Human brain connectome Updated 2025-07-16
By cranks:

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