In this Motherboard.tv episode, artist Jamie O'Shea from Substitute Materials shows how you can build a telegraph from materials that were readily available 50,000 years ago: "It's the ultimate salvagepunk experiment, a DIY exploration of what makes innovation possible, and an attempt to prove that the future could happen at any time (even if the world isn't always ready for it)."
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.