The world's first nuclear clock just ticked on — and it could help detect a fifth fundamental force of physics

By using a rare thorium nucleus as a timekeeper, physicists have demonstrated the first working nuclear clock, a device that could lead to even more precise clocks and new ways to search for dark ...
Phys.org

Japan puts world's most accurate clock on sale for $3.3 mn

Resembling a squat, wide fridge, the world's most accurate clock went on sale for $3.3 million in Japan on Wednesday. The "Aether clock OC 020" is so precise that it would take 10 billion years for it ...
Scientific American

The World’s First Nuclear Clock Is Finally Ticking

To measure time, you need a constant rhythm. For eons, the regular movements of the sun and moon have set the pace for all of life on Earth. But over millennia, humans have sought and found more ...
WBUR

The earth is moving faster, and world clocks may need to keep up

Custodian Ray Keen inspects a clock face. A new study says world clocks will need a "negative leap second" to stay accurate. (Charlie Riedel/AP) ...