Browsing: Science

Research news from physics, space, biology and climate, with the findings explained clearly and the hype separated from what the data shows.

A team at Singapore’s Centre for Quantum Technologies has measured a lutetium ion clock to an uncertainty of one part in ten billion billion, the lowest ever reported for an optical atomic clock. Two of their clocks then agreed with each other more precisely than any clock comparison in history. The reason this matters is not the record. It is that the second itself is up for redefinition.