Steve Jefferts and Tom Heavner, National Institute of Standards and Technology (IMAGE)

National Institute of Standards and Technology (NIST)

Steve Jefferts and Tom Heavner, National Institute of Standards and Technology

Caption

National Institute of Standards and Technology physicists Steve Jefferts (foreground) and Tom Heavner with the NIST-F2 'cesium fountain' atomic clock, a new civilian time standard for the United States.

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National Institute of Standards and Technology

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