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A new atomic clock at the National Institute of Standards and Technology in Boulder is helping researchers count seconds to ensure the world is on time.
The new clock is so reliable that it would be off by less than a second if it had started running 100 million years ago, ...
The National Institute of Standards and Technology's new cesium fountain clock is one of the most precise atomic clocks ever created.
Photo: Niels Bohr's research notes for his new atomic theory Rutherford's find came from a very strange experience. Everyone at that time imagined the atom as a "plum pudding." That is ...