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...omas Young (scientist)|Thomas Young]]. This experiment played a major role in the general acceptance of the [[wave theory of light]].<ref name = "Insight }}</ref> In Young's own judgement, this was the most important of his many achievements ...

{{about|the history of the standards used in the metric system|history of adoption|Metrication}} [[File:Metric and imperial systems (2019).svg|thumb|400x400px|Units in everyday use by country as of 2019]] ...

...al prototypes. Rather than the various complex systems of subdivision then in use, they also preferred a decimal system to ease their calculations. ...e many features of the [[Ancien Régime]], including [[Units of measurement in France before the French Revolution|the traditional units of measure]]. As ...