Second Coming

from physicsworld.com

A new atomic timekeeper, the strontium optical lattice clock, can measure time to within one second every 300 million years. Still, that's not perfect. "Even an accuracy of a second in 300 million years still means a lag of about 0.01 of a nanosecond over the course of a day," says the lead researcher, Jerome Lodewyck. Picky, picky, picky: http://news.nationalgeographic.com/news/2013/07/130710-atomic-clock-time-clocks-optical-lattice/