Gnat sez, "A resident of Christchurch, New Zealand, cleverly demonstrates the liquifaction that caused so much trouble in the recent earthquakes. The ground is soil and water, usually stable. When shaken, the soil clumps and water separates out: liquifaction. The result is damaged houses, fallen buildings, and a city of death and mess."
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.