Steve Jobs by Ciro Santilli 37 Updated 2025-07-16
Co-founder of Apple.
Is Jobs evil? Is he interesting? Undoubtedly.
Good quotes:
Abjad by Ciro Santilli 37 Updated 2025-07-16
Unlike abugida, these actually make you guess vowels, which are mostly or all not written down in any way. Terrible.
E.g.: the main Arabic script.
University entry exam by Ciro Santilli 37 Updated 2025-07-16
These are the most evil examinations society has.
They mean that until you are 18, you have to study a bunch of generic crap you hate just to get into university. Rather than studying whatever it is that you truly love to become a God at it as fast as possible and have any chance of advancing the field.
And then, if you decide that you want to change, which is not unlikely since you haven't really try to study what you signed up for before then, it can be very hard and time consuming, leading to a bunch of adults with useless degress they will never use at work.
With the invention of the Internet, all teaching material can be free and open source. Only laboratory space has any cost (besides the opportunity cost of participation in actual projects in a research team).
Per-country list: en.wikipedia.org/wiki/List_of_admission_tests_to_colleges_and_universities
Microphone by Ciro Santilli 37 Updated 2025-07-16
Video 1.
Testing and Circuit for a Condenser microphone by RSD Academy (2018)
Source.
Not very numerical, but shows a simple working breadboard circuit and an oscilloscope. He whistles with his mouth to get a pretty pure frequency.
That type of microphone requires a bias voltage. The circuit is in Ciro's ASCII art circuit diagram notation:
DC_9---R_10k--+--MICROPHONE--+--G
              |              |
              +-------V------+
Video 2.
Soundwaves on an oscilloscope by Animated Science (2015)
Source. Dude speaking to microphone. Some analysis of how different sounds look like. No circuit diagram.
Cultured food by Ciro Santilli 37 Updated 2025-07-16
chemistry.stackexchange.com/questions/7696/how-do-i-distinguish-between-internal-energy-and-enthalpy/7700#7700 has a good insight:
To summarize, internal energy and enthalpy are used to estimate the thermodynamic potential of the system. There are other such estimates, like the Gibbs free energy G. Which one you choose is determined by the conditions and how easy it is to determine pressure and volume changes.
Temperature by Ciro Santilli 37 Updated 2025-07-16
For scales from absolute 0 like Kelvin, is proportional to the total kinetic energy of the material.
The Boltzmann constant tells us how much energy that is, i.e. gives the slope.

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