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2010/02/13

clock: accurate to within one second over 3.7 billion years.

New optical : breaks accuracy record - physicsworld.com
A new optical clock that is twice as accurate as any other has been unveiled by physicists in the US. The clock, which is based on a single aluminium ion, could remain accurate to within one second over 3.7 billion years.
http://physicsworld.com/cws/article/news/41696

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