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 ...

Scientists from around the world are gathering in France today to decide the fate of the kilogram. For nearly 130 years, the kilogram has been based on a lump of metal called the Big K, locked in a ...

The big science-y news of last week was the vote to officially redefine of the kilogram-- see the stories in Physics World and Physics Today for more detail--after decades of work by physicists on ...