An report in the Melbourne Herald-Sun, quoting an unlinked article in the UK Mirror (a truly awful tabloid) claims that Madonna has a DNA cleanup crew who sterilize all the surfaces and vacuum all skin cells and hair follicles after Madonna uses a dressing room, to prevent fans from getting hold of her genetic material. Given the stupid provenance, it's almost certainly not true, but it's a great plot-point for some future science fiction story.
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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.