For nearly a century, scientists around the world have been searching for dark matter—an invisible substance believed to make up about 80% of the universe's mass and needed to explain a variety of ...

Scientists believe that if a nuclear clock is developed – one that uses the atomic nucleus to measure time with extreme precision – even the tiniest irregularities in its ticking could reveal dark ...

The old clock stopped, but time moved on. Like the clock, we mark moments—until one day we stop, too, while time itself ...