Rydberg atom Updated 2025-07-16
Verilator interactive example Updated 2025-07-16
The example under verilog/interactive showcases how to create a simple interactive visual Verilog example using Verilator and SDL.
https://raw.githubusercontent.com/cirosantilli/media/master/verilog-interactive.gif
You could e.g. expand such an example to create a simple (or complex) video game for example if you were insane enough. But please don't waste your time doing that, Ciro Santilli begs you.
Usage: install dependencies:
sudo apt install libsdl2-dev verilator
then run as either:
make run RUN=and2
make run RUN=move
Tested on Verilator 4.038, Ubuntu 22.04.
In those examples, the more interesting application specific logic is delegated to Verilog (e.g.: move game character on map), while boring timing and display matters can be handled by SDL and C++.
Veritasium Updated 2025-07-16
Does have some gems worth looking at. But generally always too superficial as can be expected from any self-sufficient YouTubber.
Video 1.
My Life Story by Veritasium (2018)
Source. Basically a don't be a pussy story where he describes how he has always been passionate by both science and film making. Veritasium is a nice guy.
Hash function Updated 2025-07-16
Applications:
The projects you do must always aim to achieving some novel result.
You don't have to necessarily reach it. But you must aim for it.
Novel result can be taken broadly.
E.g., a new tutorial that explains something in a way never done before is novel.
But there must be something to your project that has never been done before.
You can start by reproducing other's work.
Switzerland Updated 2025-07-16
Quartz clock Updated 2025-07-16
Video 1.
How a quartz watch works by Steve Mould (2017)
Source. Mentions feedback loop loop with the quartz tuning fork for the piezoelectricity and an amplifier. Also mentions the choice of 32768 Hertz () as the first power of 2 that is outside of the human hearing range, and then how a frequency divider is used to reduce the frequency to get the second counter.
Vertebrate Updated 2025-07-16
The big breakthrough of the vertebrates appears to be the ability to swim around in a straight line and eat smaller species that are floating about.
Bones appear to help that a lot!
It is likely the most efficient design to travel long distances. Be thin and wiggle your tail around.
Perhaps smaller animals can skip the bone thing. Maybe a notable example are the lancelets, which look a bit like small fish. But they only go up to 8 cm.
Heat equation Updated 2025-07-16
Besides being useful in engineering, it was very important historically from a "development of mathematics point of view", e.g. it was the initial motivation for the Fourier series.
Some interesting properties:
Here's to the crazy ones Updated 2025-07-16
Because the people who are crazy enough to think they can change the world are the ones who do.
The ELF standard specifies multiple file formats:
  • Object files (.o).
    Intermediate step to generating executables and other formats:
    Source code
    
        |
        | Compilation
        |
        v
    
    Object file
    
        |
        | Linking
        |
        v
    
    Executable
    Object files exist to make compilation faster: with make, we only have to recompile the modified source files based on timestamps.
    We have to do the linking step every time, but it is much less expensive.
  • Executable files (no standard Linux extension).
    This is what the Linux kernel can actually run.
  • Shared object files (.so).
    Libraries meant to be loaded when the executable starts running.
  • Core dumps.
    Such files may be generated by the Linux kernel when the program does naughty things, e.g. segfault.
    They exist to help debugging the program.
In this tutorial, we consider only object and executable files.
III-V semiconductor Updated 2025-07-16
Most notable example: gallium arsenide, see also: gallium arsenide vs silicon.
An important class of semiconductors, e.g. there is a dedicated III-V lab at: École Polytechnique: www.3-5lab.fr/contactus.php
Wang Jin (Water Margin character) Updated 2025-07-16
He used to train the 800,000 imperial guard troops at the Capital, much like Lin Chong. He's not one of the 108 Stars of Destiny.

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