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Physicists Hot for Ultracold

A laser’s light tickle tricks molecules into sitting still

By
12:33pm, December 5, 2008

Molecules are hot. They zip, spin and vibrate with frenetic motion. They jiggle and twist on the inside and bounce on the outside, imparting structure and physical properties to nearly everything that exists. But by achieving temperatures colder than any in the natural world, physicists can almost stop these speed demons cold.

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