(Adam Gault/Photographer's Choice RF/Getty Images) Researchers in China have created one of the most precise clocks ever made ...

Chinese scientists create clock so precise it could redefine second - Optical clock measures time using light emitted by ...

This breakthrough in precision timing is about the size of your fingernail and only loses one second every 30,000 years.

Scientists are exploring a new type of optical atomic clock based on ytterbium-173 ions that could help define the future standard for measuring time.