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
(2) Richard Davis on the metre go.nature.com/2MacrGp
(3) Stephan Schlamminger on the kilogram go.nature.com/2WV5Q87
(4) @TaroniAndrea on the mole go.nature.com/2DRRpgc
(5) François Piquemal on the Ampere go.nature.com/2Q9okiL
(6) Michael de Podesta on the Kelvin go.nature.com/2WSzyKT
(7) Yuqin Zong on the Candela go.nature.com/2WTKMip
Want to read more the new system of units? Joachim Fischer & Joachim Ullrich have written just the piece for you go.nature.com/2VABg29
Finally, if (a) you really can't contain your excitement and (b) happen to be in Berlin, you can join us in our #WorldMetrologyDay celebration. Registration is FREE: go.nature.com/worldmetrology…
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