MinutePhysics - terrible drawings accompany beautiful explanations of our universe 

SmarterEveryDay - a guy, Destin, goes out his way to figure out how dome random things work

Veritasium - a well-groomed Canadian-Australian proceeds to tell Americans how to do Physics

Vsauce - some ideas are so obscure that they have to make a YouTube channel out of it

melodysheep - autotuned to the key of science

Sixty Symbols - as if one was enough