Browsing: Wearables

Watches, rings, bands and glasses you actually wear, with coverage of sensors, health claims, battery life and whether the data can be trusted.

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.