Photography http://www.ced.org.es/index.php/protonix-mg purchase protonix The ytterbium clock芒聙聶s ticks are stable to about one part in one quintillion (1 followed by 18 zeros), meaning the clock can calculate a second exactly the same up to the eighteenth decimal place, a feat that makes it about 10 times better than its predecessors, according to a NIST study, published in the journal Science Express on Thursday.
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