Deep underneath the Parisian suburb of Saint-Cloud, in a vault that can only be opened by three people wielding three different keys, there lies a hunk of metal that is so crucial to the world of ...

It’s a problem that has been weighing on scientists’ minds for years – how to redefine and accurately measure the kilogram. Currently the unit of measurement is based on a metal cylinder - which ...

Measuring systems are almost always arbitrary – even the orderly metric system is chopped up into random little pieces we call grams, kilograms, and tons. With the increased need for precision, it’s ...

The kilogram may finally get a break from its yo-yo diet. An international team of scientists is closer to redefining the unit of mass based on fundamental constants, instead of a piece of metal in ...

If John Pratt were an international criminal mastermind, he would fly to Paris, don an all-black suit and ski mask and sneak into the elegant French baroque building that serves as headquarters for ...