Wagner James Au writes in with novel uses for a 3D printed Hilbert curve like the one I blogged last week: "Mathematician Henry Segerman creates copies of a 3D printed Hilbert curve he originally made in Second Life which, thanks to its twisty material, can also be worn as a geekily fashionable hair accessory!"
Fractal Cube Originally Made in SL Now on Sale in RL (Thanks, James!)
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.