Mark W Shead uses the terrifying design of this air pistol (you have to point is straight at your face to check the pressure) as a jumping-off point for a short, to the point essay on "domain knowledge" and software design.
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.