Welcome to a world where teacups melt through saucers and everyone walks through walls IS it possible to walk through walls?  Can solid objects really pass through each other? Moses Chan thinks they can, and he says he has the proof. Chan and his colleagues at Pennsylvania State University have created the world's first "supersolids", bizarre crystals that slide through each other like ghosts. It is a finding that promises to revolutionise the way we think about matter.  "It really changes one's concept of solids," says Jason Ho, a solid-state theorist at Ohio State University in Columbus. The idea that one solid object can flow through another contradicts all our everyday experiences: no one has ever seen a teacup dissolve through a saucer. And when you prop up the bar on Friday nights there is no danger of you slowly melting into the surface and falling out the other side.

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