"Physical Impossibilities in My Little Pony: Friendship is Magic" is a student physics presentation that examines three scenes from an animated My Little Pony show (it looks like a recent adaptation, not the original) and identifies the physics at work, explains (with equations!) why the scenes don't work, and offers suggestions ("dark matter!") to fix them. The student has posted his slides as well. He says he got 100% on the presentation, and I believe it was a well-deserved grade.
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.