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 DIRECTORY/Reference/More Groups/Time/Clocks and Watches (7)
i0Biological Clocks Virtual Museum - http://www.hhmi.org/biointeractive/clocks/museum.html - This exhibit explores the inputs, outputs, and mechanisms of biological clocks with a primary focus on circadian rhythms.
 
i0Cesium Atomic Clocks - http://tycho.usno.navy.mil/cesium.html - Kinds of cesium clocks, with pictures, plus a description of their operation and the science behind them.
 
i0Doug's Atomic Clocks - http://www.niceties.com/atomic.html - Details on Doug Hogarth's experiments with his atomic clock.
 
i0How Stuff Works: Atomic Clock - http://www.howstuffworks.com/atomic-clock.htm - Concise history, background, definitions and operational information regarding atomic clocks.
 
i0How Stuff Works: Pendulum Clock - http://www.howstuffworks.com/clock.htm - Concise description using drawings and animation to show the operation of a pendulum clock.
 
i0Smithsonian Institute - On Time - http://americanhistory.si.edu/ontime/ - History of the clock and how Americans have measured time and been affected by it.
 
i0Watch Source Guide - http://www.watchsourceguide.com - Comprehensive source of information about watches. Includes sections on watch functioning, maintenance, articles and more.
 
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