[sethgecko]

This is my favourite channel on youtube, it focuses a lot on information theory and cryptography.

https://www.youtube.com/user/ArtOfTheProblem

[zengid]

I really like the use of music in these videos (or at least the main one presented on the channel's homepage). There's something about simple atmospheric 'textural' music behind people talking about stuff that gives me enjoyment.