Made to measure
The government started reviewing whether we should stay two metres apart while social distancing or whether one metre would do. What is a metre?
— Since 1960 it has been defined as the distance travelled by light in a vacuum in 1/299,792,458th of a second.
— But it was originally defined by the post-revolution French government as one ten-millionth of the distance between the Equator and the North Pole, on a meridian through Paris.
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