Extremely Accurate Atomic Clock Loses One Second Every 300 Billion Years - CNET
Scientists measure Einstein's theory of general relativity at the tiniest scale ever recorded.
JILA researchers measured time dilation, or how an atomic clock's ticking rate varied by elevation, within this tiny cloud of strontium atoms.
JACOBSON/NIST
Atomic clocks are already the world's mo… [+2234 chars]
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