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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
A brief description of how atomic clocks work to keep track of time accurately. From HowStuffWorks.com.
Interactively explore the timeline of the universe.
A great short article on how atomic clocks work from NPL
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.
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!
A look at the results from BICEP2 detector in the south pole which gives evidence for inflation happening at the start of the universe.
Showing 1 - 10 of 145