educational stock video footage for my nephew

My nephew has been watching entirely too many smarmy internet videos for my comfort. It’s not that they’re trashy exactly, just that they are pure brain candy. He doesn’t need cranial crack, he needs something educational and fun. Does anyone know where I can find some educational stock video footage for him to watch? It could be of people gardening, or skateboarding, or even chasing tornadoes for all I care. As long as he learns something constructive from it, and he can find it on-line, then we’ll both be happy. Well, I’ll be happy, at least, knowing that he’s not throwing his mind away.