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Happy World Metrology Day! Today, 7 fundamental constants of nature are redefined as exact numerical values, in turn redefining base units such as the metre and the kilogram. Find out more about this reformation in Bill Philips' #MeasureForMeasure column | go.nature.com/endofartefacts 
Metrology is a fascinating, and hugely important, discipline - one that underpins our fundamental understanding of science as much as the practical foundations of all international commerce throughout human history. It is worth celebrating in full: go.nature.com/2HqOs5P
You can read more about the re-defined base units in our metrology column, Measure for Measure - it is free to read and includes pieces on all the redefined base units. (1) Helen Margolis on the second go.nature.com/2BJiQ5E
