Tha Business is a concept design by Hoang and Anh Nguyen that rethinks a number of antipersonnel objects (pepper spray, knives, brass knuckles) as stylish, wallet-sized gizmos. Also includes a whistle.
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.