TITLE: Mathematical YouTube channels?
QUESTION [21 upvotes]: So I'm wondering if anybody knows any good math/science related YouTube channels? As for the math channels, I'm currently subscribed to Numberphile, and that is about it. I know few other channels, only ViHart actually (combining math and art). As for science-related channels, there are a lot more, like MinutePhysics, Veritasium and (sometimes) VSauce. 
Does anyone got some other suggestions?
Thanks!

REPLY [2 votes]: Flammable Maths
is sometimes entertaining with good integrals that are sometimes challanging.