While nearly the entire world has adopted the international metric system of measurement, The United States still relies on a system of measurements based on the sizes of thumbs, feet, wingspans and leaps. So why doesn't the U.S. use the metric system?
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Read more about the metric versus imperial systems:
The White House: Petition to Make the Metric system the standard in the United States, instead of the Imperial system
Discovery News: As Kilogram Model Shrinks, Alternatives Sought