These videos are called Kid History. There are 9 of them and they are all hilarious! Go watch them!
This next video is by this girl named Vi Hart. She is an extremely talented mathemusician. Yes, she talks about super confusing things and sometimes sings about them. I hate to say this, but she makes math fun. :)
Tobuscus is another person I watch pretty often. He's super funny and he does great game commentary. Go watch some of his videos!