PBS Nova and Frontline often have their latest episodes on Youtube, they go more in depth than commercial documentaries. "Boeing's Fatal Flaw" in a great example: https://www.youtube.com/watch?v=wXMO0bhPhCw

Georgia Tech professor Aaron Lanterman has class lectures on music synthesis, electric guitars amps and effects, and general electronics: https://www.youtube.com/c/Lantertronics

Documentaries Particle Fever CERN: https://www.youtube.com/watch?v=5Lx109jdGCc

Slingshot, Dean Kamen - has the origin of FIRST Robotics: https://www.youtube.com/watch?v=0AsJXjK0CSo

"Origins of Precision" Best video from Machine Thinking: https://www.youtube.com/watch?v=gNRnrn5DE58

Bitboards for chess board representation, the fastest and most complex such representation: https://www.chessprogramming.org/Bitboards Other structures for chess are easier to follow and understand: https://www.chessprogramming.org/Board_Representation