Atomic clocks keep time by means of quartz crystals and periodic radio-controlled synchronization with the NIST atomic clock. Visitors to this website will find comparisons of radio-controlled clocks and watches.
A wall clock can serve as a stylish wall decoration in addition to telling time. Modern wall clocks use quartz movements run by battery power, while traditional wall clocks may rely on weights and pendulums.
Using a technique that dates when quartz was last exposed to sunlight, researchers determined the limestone vessels in Laos' Plain of Jars are centuries older than previously believed.
Daily Mail. Wed, 28 Apr 2021 19:57:22 GMT.