The definition of kilogram changed TODAY - and is no longer be based on a ...
(World News Science)

THE DEFINITION of the kilogram has changed forever, 130 years after it was first established. This change was unanimously voted for at the General Conference on Weights and Measures at the end of last year because kilograms were not based on the constants of physics that we know today. Greg L/Wikimedia Commons 3 The new kilogram definition has come into effect now because May 20 is World Metrology Day, a...