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.
An intriguing new book by an economist who writes a column for Quartz discusses ways of reducing risk in many walks of life, our reviewer says.
Paul B. Brown. New York Times. Fri, 12 Apr 2019 10:45:04 GMT.