Inside the Beating Heart of an Optical Atomic Clock

Behold, the beating heart of a time machine! Or "clock", as most people call them, but this one is nothing like your grandfather's. This super-accurate timekeeper is an optical atomic clock built by the UK's National Physical Laboratory (NPL) and its tick is governed by a single ion of the element strontium. » 2/05/13 9:20am 2/05/13 9:20am