Lutetium clock is the best timekeeper ever

Physicists have unveiled the world’s most accurate clock — a timepiece so reliable that it would take more than 260 billion years to lose a second. The device is an ‘optical’ atomic clock, which derives time using the visible-range frequency of light at which an element — in this case, the rare-earth metal lutetium — absorbs radiation. The researchers behind the clock say that it is robust enough that they hope to be able to miniaturise it and eventually take it out of the lab.