By Jamie Condliffe

If you think your fancy watch is accurate, think again. This atomic clock—the most accurate in the world—is now so finely tuned that it will lose a single second at most over the course of 15 billion years.

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Source:: http://feeds.gawker.com/~r/gizmodo/full/~3/gEKZF71fS1k/this-clock-only-loses-one-second-every-15-billion-years-1699399446