I'm amazed none of these have been mentioned yet. Here are some of my faves
Explaining stuff that's happening
- Real Life Lore (I'm almost signing for Nebula because of him, gorgeous map graphics)
- Cold Fusion
- Wendover
History stuff
- Fall of Civilizations - Hands down the best documentary-like content I know of. Takes forever for new stuff to show up (because research), but it's so fucking worth it!
- Study of Antiquity and the Middle Ages
- Kings and Generals (the narrator butchers every non-anglo name, it really grinds my gears)
- Heroes and Legends - The long form, documentary-level videos are amazing. Watch the ones on Gertrude Bell and Voltaire
Gamurrs
- Basement Brothers - Almost monotone narration, but possibly the only channel in english that plays and shows several details of old Japan exclusive PC games (PC88 and PC98 mostly)
- Russian Badger - There's a very high chance you've seen some of the memes straight out of his videos. Start with "Heavy flamer heresy" if you've never seen any.