Disappearing Spoons sells kits to make your own gallium prank-teaspoons. Gallium spoons weigh nearly as much as stainless steel ones, and have a similar finish, but they dissolve in hot liquids like tea. When the tea cools, the gallium forms a lump in the cup, ready to be molded into a new prank-spoon!
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.