Håkan Dahlström got this delightful shot of one of San Francisco's steeper hills, turning his camera so that the road (and not the houses) were at level to convey the extent of the slope.
Crazy hills of San Francisco (Thanks, Fipi Lele!)
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.