How much is a kilogram? It turns out that nobody can say for sure, at least not in a way that won’t change ever so slightly over time. The official kilogram – a cylinder cast 118 years ago from ...

Senior Lecturer, Canberra School of Politics, Economics and Society, University of Canberra Later today we’ll know what the bushfires and the coronavirus did to the economy in the three months to ...

For decades, metrologists have strived to retire ‘Le Grand K’ — the platinum and iridium cylinder that for 126 years has defined the kilogram from a high-security vault outside Paris. Now it looks as ...