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…Meters have changed?

Meter

Though we usually assume that distances are fixed (a mile is a mile is a mile) the official definition of a meter has changed numerous times through out history.

Each time, the definition of a meter became more precise, but it also changed slightly from the previous definition, allowing for less and less of the variation inherent in each measuring system.

Bonus: The only three countries not currently using the metric system: Liberia, Myanmar, and the United States.

[Good Magazine – Weights And Measures]

[Via: swissmiss]