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Comments (2)
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Looks very nice but doesn't really fit well in blogs
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msserrano on Mar 4, 2009
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Wow This Is Overly Advertised With Cheesy Animation Effects Anyway
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bluechoco4life on Jan 19, 2008
by 7art Studio
Created 5/4/07
The first accurate atomic clock was built in 1955. Since when the second being based on atomic time and defined as the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the caesium atom.
