Researchers have just come up with a new type of atomic clock even more precise than the current technology in use. The clock is accurate to one second in the lifetime of the Universe - about 15 billion years - and it works on the same basic principle that microwave atomic clocks have used since the 1950s. However, the new clock uses optical light, which is of a higher frequency, providing more accurate timekeeping.
http://www.cosmiverse.com/science07130101.html
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