A team of scientists recently carried out the most comprehensive study to date of exercise performed at different times of the day.

Norman Yao first described five years ago how to make a time crystal—a new form of matter whose patterns repeat in time instead of space.

It would take 15 billion years for the clock that occupies Jun Ye's basement labto lose a second—about how long the universe has existed

A new study reveals the complex history behind one of the Grand Canyon’s most well-known puzzles called the Great Unconformity.

The possibility of time travel has excited many of us for hundreds of years, inspiring countless books and films.

Designed to improve navigation for robotic explorers and the operation of GPS satellites, the technology demonstration reports a significant