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The Hippo roller is a simple tool for transporting water from water-holes to homes, an alternative to the traditional barrels-on-heads. The Hippo Roller is like a barrel with a handle that you push ahead of you like a steamroller's drum.
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(Thanks, Anonymous!)
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.