Everything from 3 blue 1 brown: https://www.youtube.com/c/3blue1brown
Visualization of Quantum Physics (Quantum Mechanics): https://youtu.be/p7bzE1E5PMY
history of the entire world, i guess: https://www.youtube.com/watch?v=xuCn8ux2gbs
TIMELAPSE OF THE FUTURE: A Journey to the End of Time (4K): https://youtu.be/uD4izuDMUQA
Humanity was born way ahead of its time. The reason is grabby aliens. and Grabby aliens: when we'll meet them, how big they are, and other predictions
Everyday Astronaut videos (he has 90 min documentary on Soviet rocket engine): https://www.youtube.com/channel/UC6uKrU_WqJ1R2HMTY3LIx5Q
Cool Worlds - a lot of 25-35 min very nice astronomy explanations: https://www.youtube.com/c/CoolWorldsLab
'A Universe From Nothing' by Lawrence Krauss: https://www.youtube.com/watch?v=7ImvlS8PLIo