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发帖数: 298 | 1 Like most people at work, physicist Tom Parker watches the clock. But unlike
most people, it's Parker's job. He keeps an eye on the world's most accurate
timepiece, the F-1 Cesium Fountain Atomic Clock. Parker's effort is crucial
to everything from running the Internet to managing spacecraft and making
accurate astronomy observations.
Yet telling time on Parker's $200,000 clock, which behaves less like a Rolex
than a toy-sized factory, is rather impossible. In fact, Parker checks it
only every f |
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