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Published online 23 February 2007 | Nature | doi:10.1038/news070219-13

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Nature's X-files

Not all the correspondence to a top science journal contains top science. Some of it is very odd indeed.

Some institutions attract outlandish claims. Curators at London's Science Museum are used to meeting visitors clutching perpetual-motion machines — claims often undermined by the batteries attached to the device.

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