Wait, did you see this horrifying thing on the kilogram, a measure of weight (yes, yes it is) that is actually tied to a real object? (Which affects the "pound," as the pound is now basically defined as 0.45359237 kilograms!) Familiarly known as Le Grand K and held in a vault just outside of Paris under three bell jars, it dates back to the 1880s, when it was forged by the British metallurgist George Matthey from an alloy of nine-tenths platinum and one-tenth iridium. As a metric unit, the kilogram is “equal to the mass of the international prototype,” according to the official definition. In other words, as [...]