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Very accurate clocks can be constructed by locking an electronic oscillator to the frequency of an atomic transition.
A long read about the history of the atomic clocks
Interactively explore the timeline of the universe.
A brief description of how atomic clocks work to keep track of time accurately. From HowStuffWorks.com.
A great short article on how atomic clocks work from NPL
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 ...
Various applets allowing results to be taken for demonstration purposes.
A fun toy that lets you build a sledge run and then test it out. You'll need a good feel for the laws of motion to get results!
Kaufmann's experimental results on deflection of electrons in an electromagnetic field favoured Abraham's theory, not Einstein and Lorentz, but were eventually proved wrong.
More information on how GPS satellites calculate your location, from using accurate atomic clocks to ensuring enough coverage.
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