Image: NIST-F2 cesium fountain atomic clock
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Description: NIST physicists Steve Jefferts (foreground) and Tom Heavner with the NIST-F2 cesium fountain atomic clock, a new civilian time standard for the United States.
Title: NIST-F2 cesium fountain atomic clock
Credit: http://patapsco.nist.gov/imagegallery/details.cfm?imageid=1319
Author: National Institute of Standards and Technology - Physics Laboratory: Time and Frequency Division
Usage Terms: Public domain
License: Public domain
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