S38 Ep18: The Amazing Atomic Clock

Aired: 11/14/2011 | 0:03:59 | Clip
Dr. Steve Jefferts of the National Institute of Standards and Technology in Boulder, Colorado is an expert on how we measure time. In fact, he uses one of the world's most accurate atomic clocks to calibrate time in the United States. But why do we need such accuracy? Learn why atomic clocks are so important in our everyday lives.

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