EUROPE — Every clock in your house probably tells a slightly different time. Now picture those clocks as the most precise instruments humanity has ever built, so accurate that they wouldn’t lose or ...

Clocks pervade our lives, from the cellular clocks inside our bodies to the atomic clocks that underlie satellite navigation. These atomic clocks can measure time accurately to within one second in ...

European researchers had, in effect, measured space by measuring time You can save this article by registering for free here. Or sign-in if you have an account. The Global Positioning System, or GPS, ...

A new experiment involving a network of entangled atomic clocks could finally help us test how quantum mechanics fits with general relativity. Quantum mechanics is our best understanding of the ...