On May 20th, the kilogram will no longer be defined by a lump in France

On May 20th, World Metrology Day, the scientific community will officially change the definition of the kilogram. For 130 years, the kilo has been defined by a physical cylinder of platinum-iridium alloy, known as Le Grand K and stored in a vault out…
Source: Engadget | On May 20th, the kilogram will no longer be defined by a lump in France