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 ...

Add Yahoo as a preferred source to see more of our stories on Google. Le kilogramme est mort. Vive le kilogramme! The U.S. National Institute of Standards and Technology called this Friday a “turning ...

It’s the end of an era. After 130 years of faithful service, the so-called “prototype kilogram” upon which nations base their weight measurements was just replaced by a new standard based on ...

Meters, kilograms, degrees Celsius. To most Americans, these units of measurement are little more than funny inconveniences on trips abroad. To scientists, they’re the very standards that allow for ...

In a subterranean vault in a suburb of Paris lies a small, rarely seen metal cylinder known as Le Grand K. For 130 years, this golf-ball-sized hunk of 90% platinum and 10% iridium has served as the ...

Update, May 20th, 2019, 10AM ET: This article was originally published in November 2018. As of May 20th, 2019, World Metrology Day, the new definition of the kilogram based on Planck’s constant has ...