A Clock So Precise That It Detects Tiny Shifts In The Flow Of Time

In a basement lab at the University of Colorado Boulder, researchers have built the world's most accurate atomic clock — it can keep perfect time for 5 billion years. But the clock is so precise that it's run into a problem. Time doesn't move at the same rate everywhere in the cosmos, or even on the surface of Earth. » 11/05/14 7:40am 11/05/14 7:40am