![French physician Rodolphe Le Targat poses next to one of two optical lattice clocks (OLC) in a laboratory at the Paris Observatory July 22, 2013. France-based physicists have designed a clock whose French physician Rodolphe Le Targat poses next to one of two optical lattice clocks (OLC) in a laboratory at the Paris Observatory July 22, 2013. France-based physicists have designed a clock whose](https://c8.alamy.com/compfr/2e5mr50/french-physician-rodolphe-le-targat-poses-next-to-one-of-two-optical-lattice-clocks-olc-in-a-laboratory-at-the-paris-observatory-july-22-2013-france-based-physicists-have-designed-a-clock-whose-use-of-laser-beams-to-measure-atomic-vibrations-makes-it-up-to-three-times-more-accurate-than-atomic-clocks-and-could-lead-to-a-more-precise-definition-of-the-second-the-team-of-five-researchers-at-the-paris-observatory-says-the-new-timekeeper-is-so-accurate-it-will-neither-gain-nor-lose-a-second-over-a-period-of-300-million-years-against-100-million-years-for-the-atomic-clocks-around-the-world-th-2e5mr50.jpg)
French physician Rodolphe Le Targat poses next to one of two optical lattice clocks (OLC) in a laboratory at the Paris Observatory July 22, 2013. France-based physicists have designed a clock whose
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