Researchers at the Japan Institute of Technology have a killer demo for their controlled quantum levitation technology: they outfitted little slot-car-style RC cars with liquid nitrogen tanks and sent them whizzing around a track modelled on the classic video game Wipe Out.
Update: Many commenters believe that this is faked. They can tell by the pixels apparently. And the physics. It's still awful fun to watch.
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.