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A black atomic clock sits on a wood-grained desk, using atomic vibration technology in order to measure time.  Because this way of measuring time is extremely accurate, atomic clocks are used in a variety of scientific endeavors, as well as by the United States' Department of Defense.  But you don't have to be a scientist to find value in atomic clocks.  Any time the power goes out, or any time we change the time due to Daylight Savings, we know what time to set our clocks to, thanks to the US Naval Observatory's Master Clock, one of the world's most well-known atomic clocks.