Time to redefine Time?

In an engaging conversation William D. Phillips and Rainer Blatt shared their reflections on recent changes to the definitions of the SI units, and debate whether a truly timeless definition of time will ever be achieved.

How a Physics Nobel Prize Led to the Redefinition of the Kilogramme

On 20 May 2019, new definitions of the System of Units (SI) come into force. How did the work of Nobel Laureate Klaus von Klitzing contribute to the improved SI.