Thought Emporium: New open-source science every week
Applied Science: Interesting applications of science and technology
Foresight Institute: Guiding technological development towards an abundant future
Numberphile: Videos about numbers
NileRed: Show the natural beauty of chemistry in fun ways
TIK: World War 2 history documentaries
TierZoo: Analyzing biology and ecology as the world’s biggest, oldest video game
Scott Manley: Orbital mechanics and rocket science
3 Blue 1 Brown: Some combination of math and entertainment