Atomic Watches
A recent development is the radio controlled wristwatch or as they are sometimes called "atomic watches". These wristwatches receive a radio signal from the National Institute of Standards and Technology located in Colorado in the United States. This radio signal tells the radio wristwatch exactly what time it is. About 4 times per day a radio wristwatch will check this radio signal and reset itself to the exact time. It will also reset itself when daylight savings time changes. These watches always know what time it is.
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