Scientists have unveiled an atomic clock that sets new records in timekeeping — it could run 5 billion years without gaining or losing a second.... Tickety-Tock! An Even More Accurate Atomic Clock ...
20140124_atc_tickety-tock_an_even_more_accurate_atomic_clock.mp3?orgId=1&topicId=1007&d=233&p=2&story=265247930&t=progseg&e=265631553&seg=4&ft=nprml&f=265247930 ...
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