Turns out it's a pretty important ... they help the world define what time it is, right now, down to the nanosecond. Without these clocks – and the people, technology and procedures around ...

R esearchers have developed a new approach in optical atomic clocks that brings forth a major goal in science: the redefinition of a second. The fundamental unit of time could soon be based on ...

“We’re just starting to lay this out,” says ... Although the definition of the second is the same everywhere, the general theory of relativity dictates that clocks tick slower in stronger ...