World’s coolest ‘clock’ is also crazy-accurate

New timepiece, based on cesium atoms, is the world’s most precise

By Janet Raloff, 16:37 PM April 15, 2014

On April 3, U.S. scientists announced the launch of the world’s most accurate atomic clock. It’s three times better than the United States’ former top clock. The new timepiece — named NIST-F2 — is so precise that it loses (or gains) no more than one second every 300 million years. That makes it about a million times more accurate than the first atomic clocks, built back in 1955.

The new clock takes its name from where it was born — at the National Institute of Standards and Technology, or NIST...

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