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Atomic Clock

Very accurate clocks can be constructed by locking an electronic oscillator to the frequency of an atomic transition.

http://hyperphysics.phy-astr.gsu.edu/hbase/acloc.html#c1

The story of atomic clocks

A long read about the history of the atomic clocks

http://www.sciencemuseum.org.uk/onlinestuff/stories/atomic_clocks.aspx

How Atomic Clocks Work

A brief description of how atomic clocks work to keep track of time accurately. From HowStuffWorks.com.

http://www.howstuffworks.com/atomic-clock.htm

Explore Big History

Interactively explore the timeline of the universe.

http://www.chronozoomproject.org/

How do atomic clocks work?

A great short article on how atomic clocks work from NPL

http://www.npl.co.uk/educate-explore/what-is-the-time/how-do-atomic-clocks-work

Squishy Circuits

An activity to do at home to explore the world of circuits. Make two types of dough, one that carries electricity and one that doesn't, to create all sorts of circuits and explore how they work.

http://www.sciencefriday.com/blogs/09/05/2014/squishy-circuits.html

The Untold Story of Getting from Here to There | Time and Navigation

A site from the Smithsonian dedicated to exploring the relationship between time and navigation from how sailors needed accurate clocks to determine their longitude to how satellites navigation ...