Add Yahoo as a preferred source to see more of our stories on Google. Chinese scientists create clock so precise it could redefine second Chinese scientists have engineered a clock so accurate it ...

Chinese scientists have engineered a clock so accurate it could lead to a redefinition of the second and an ultraprecise global time standard. The new optical clock is so accurate that it loses or ...

Scientists have created a clock so precise it could redefine the second. The strontium optical lattice clock is one of the most accurate timepieces ever made, capable of measuring seconds to 19 ...