Lately, here are a few: Periodic Videos Dr John Campbell Life in Jars The Hydraulic Press channel Alec Steele
Cole The Cornstar Black Acres Of The Gambia MIT Open CoarseWare Mostly it's just searching for a specific subject and it's a single time view but some are just entertaining and I watch for a period of time. I recognize a couple of videos from those mentioned by others above...just as Periodic Videos and Bald and Bankrupt. The later I don't find that interesting. The former I have watched quite a few.
The one I've watched the most: Critical Role - watching a group of American actors/voice actors playing D&D for 3-4 hours at a time... and two campaigns stretching over 100+ episodes each... addictive, I assure you. Please Register or Log in to view the hidden image!
Good Mythical Morning Katchats I discovered the last one while looking up how to pronounce a particular vowel combination in Finnish. I've been able to learn some bit of Finnish from her videos.(a language both my parents spoke, but I never learned)