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Puttyworld sells a $9 magnetic silly putty substance -- and it's goth black to boot.
Black Thinking Putty noticably responds to a magnet. Try pulling out a thin strand with your fingers and holding the magnet nearby. Or roll it into a ball and watch it roll right to the magnet, even uphill. The stronger the magnet the better the result, Neodymium Iron Boron works best. You can purchase some from our accessories category.Link (via FARK)
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.