The Weekly Newsmagazine of Science
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Time Machines Ancient calendars, early timekeepers, mechanical and atomic clocks are all part of a "Walk through Time," presented by the National Institute of Standards and Technology's Physics Laboratory. Go from humankind's earliest efforts to measure time to the NIST Web clock, which compares the official atomic clock's time to the time your computer displays. Go to: http://physics.nist.gov/GenInt/Time/time.html Recently on Science Safari: |
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