11. Stanch blood with a single finger!Link (via Digg)
Pinching your nose and leaning back is a great way to stop a nosebleed -- if you don't mind choking on your own O positive. A more civil approach: Put some cotton on your upper gums -- just behind that small dent below your nose -- and press against it, hard. "Most bleeds come from the front of the septum, the cartilage wall that divides the nose," says Peter Desmarais, M.D., an ear, nose, and throat specialist at Entabeni Hospital, in Durban, South Africa. "Pressing here helps stop them."
12. Make your heart stand still!
Trying to quell first-date jitters? Blow on your thumb. The vagus nerve, which governs heart rate, can be controlled through breathing, says Ben Abo, an emergency medical- services specialist at the University of Pittsburgh. It'll get your heart rate back to normal.
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.