TODAY is World Metrology Day. That’s metrology, not meteorology. It celebrates the signing of the Metre Convention on May 20, 1875 which established the metre as a standard unit of measurement. 1.
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Why's a meter a meter?
Description: Meter is the standard unit of length used by most countries around the world. But how did they define it? Hosted by: Hank Green Want more SciShow in person? We'll be at NerdCon: ...
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