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Please wait http://www.conciergerie-solidaire.fr/vitrine/qui_sommes_nous bactrim ds oral According to an NIST release, the clock’s stability is derived from how precisely the duration of each tick matches every other tick. The ytterbium clock ticks are stable to within less than two parts in one quintillian (1 followed by 18 zeros), which is around ten times more precise than the best results for other atomic clock, scientists said.