This short video demonstrates the iconic Indian "Phat Phat Boat," a cheap kids' toy sold at festivals. It has a tiny steam boiler powered by a bottlecap filled with paraffin with a little wick, and when powered, it poots around in adorable circles.
It's part of Arvind Gupta's lovely Toys from Trash series, which has dozens of great projects you can make at home.
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.