I really like numberphile since I am deep down a math nut. I also enjoy techmoan for his reviews of classic audio/video gear. Anyone out there like watching restoration videos? Generally a 20-30 minute video of someone restoring an antique toy, lamp, etc? tysytube and repairrestore are 2 of my faves. Some of my other faves:
Officer401 - probably the best cop in the US
LouderWithCrowder - Always good for a laugh
WatchMojo - Enjoyed the game of thrones videos
The Rubin Report - informative and Dave Rubin is a pretty authentic guy
Hickok45 - The old Tennessee gentleman that knows more about guns than 99% of the other youtubers combined.
Technology connections - old retro tech failures are always fun to dissect with hindsight.
Engineering explained - engaging and fun to watch for a nerd like me
Some of my really really fave youtubers:
Biographics - Simon Whistler rocks! And he's handsome! In fact any Simon Whistler youtube channel is really quite good
Martys Matchbox Makeovers - An Aussie guy who restores vintage matchbox cars. He's a real hoot sometimes, although sometimes he's serious.
Doug Demuro - because I like cars and he's 100% honest because he doesn't take money from manufacturers to write rosy reviews
Tysytube - this guy in Europe has some serious restoration kung fu.
Honest Trailers - Not as much content as they used to, but some of the older stuff is hilarious and worth watching again some times.
Techmoan - informative and always interesting
peacejoytown - a massively skilled Japanese guitarist.
And.....
VSauce - I've watched some of his video 10+ times and I'm sure I'll watch them 10+ times more. One of the most interesting and educational youtubers out there.