Even constants are on the move.
So you can use the "right" value for the speed of light, or Avogadro ... they are all authoritatively on-line at
the NIST Reference of Constants, Units, and Uncertainty ... just thought you should know.
(Afterthought: Perhaps it would profit some journalists to
read about uncertainty inview of the rabid interpretation of the excess of voter polls which have been mis-interpreted during the election.)
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