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Another year https://conscioustraining.es/naproxen-550-mg-tablet-ekud naproxen biverkningar fass Researchers built these atomic clocks by trapping thousands of ytterbium atoms at high density. Each ytterbium clock depends on about 10,000 rare-earth atoms cooled to 10 microkelvin, or 10 millionths of a degree above absolute zero. The atoms are trapped in in optical lattice made of laser light. Another laser that âticksâ at a the incredible rate of 518 trillion times per second instigates a transition between two energy levels in the atoms. The massive number of atoms is the key to the clocks stability, researchers explained.