Comment by rudolfwinestock

Freya Holmér covers the math and programming behind computer graphics: https://www.youtube.com/c/Acegikmo

Here are some more mathematics channels:

https://www.youtube.com/user/HarveyMuddCollegeEDU

https://www.youtube.com/c/Aleph0

https://www.youtube.com/c/3blue1brown

Here are some channels on physics:

https://www.youtube.com/c/TenMinutePhysics

https://www.youtube.com/channel/UCPZvrtffxEZ7KZQ9dYCG0xg <- Carver Mead's channel.

Here's something of historical interest: all of the episodes of The Computer Chronicles. https://www.youtube.com/user/ComputerChroniclesYT