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I can't get through at the moment omeprazole 20 mg uses According to the scientists, the high stability of the ytterbium clocks helps achieve precise results very quickly. For instance, the current U.S. civilian time standard is NIST-F1 -- a cesium fountain clock -- which must be averaged for about 400,000 seconds (about five days) to achieve its best performance. On the other hand, the new ytterbium clocks achieve that same result in about one second of averaging time.