The world's most precise clock can keep time for 5 billion years

If you want to know exactly what time it is, head of over to Boulder, Colorado, where a fountain of cesium atoms ticks off the U.S.'s official time. It should be accurate for the next 300 million years. But don't be impressed—the world's actual most precise clock is a few miles away at a different lab in Boulder,… »11/03/14 6:34pm11/03/14 6:34pm

New Atomic Clock Will Be Accurate for 200 Million Years

Physicists at the Joint Institute for Laboratory Astrophysics have developed a new atomic clock that is so accurate, it will not lose a second of time in more than 200 million years. That makes the old atomic clock record holder and its 80 million year accuracy rating look like something you would get out of a gumball… »2/15/08 6:50pm2/15/08 6:50pm