- Art of the Problem, provides introductory videos on Information theory, https://www.youtube.com/channel/UCotwjyJnb-4KW7bmsOoLfkg

- Fosdem talks, https://www.youtube.com/channel/UC9NuJImUbaSNKiwF2bdSfAw

- Minimalist Programming with jekor, stuff on haskell, like a teardown of Pandoc, implementation of redo, Minimalist Programming with jekor

- Veritasium, mainly physics, https://www.youtube.com/channel/UCHnyfMqiRRG1u-2MsSQLbXA

- Vi Hart, the best thing about mathematics that's online, https://www.youtube.com/channel/UCOGeU-1Fig3rrDjhm9Zs_wg

- Brady Haran's channels on various scientific topics, http://www.bradyharan.com/