Samsung and Apple are in a race to add as many health sensors to the back of their devices, and still the most we can hope ...

Inside the National Institute of Standards and Technology, or NIST, a new atomic clock named NIST-F4 has begun to tick — not with the sound of gears or bells, but with the quantum pulse of cesium ...

F4, the latest cesium fountain clock that now stands as one of the most accurate timekeepers in the entire world.