Fun Fun Function, JS specific: https://www.youtube.com/channel/UCO1cgjhGzsSYb1rsB4bFe4Q
Computerphile, general CS topics and computing history: https://www.youtube.com/user/Computerphile
Biographics, 20-minute biographies of historical figures: https://www.youtube.com/channel/UClnDI2sdehVm1zm_LmUHsjQ
Intelligence Squared, long-form structured debates on current-day issues: https://www.youtube.com/user/iqsquared