It doesn’t look like much now. But by the time it’s finished, it will be a whirring, clicking, whooshing, flashing timepiece powered by the pull of the Earth. It is the Great Gravity Clock, a $600,000 ...

The scientists at the National Institute of Standards and Measurement have one big job: to measure things as accurately as possible. To do that, they build a lot of big and complicated machines, ...

Researchers at at JILA, a joint institution of the US National Institute of Standards and Technology (NIST) and the University of Colorado Boulder have developed an atomic clock that can detect the ...