“The best time to plant a tree was 20 years ago. The second best time is now.” Origin uncertain, usually attributed as a Chinese Proverb.
Wednesday, 13 July 2016
Weights are measured
As part of the project to redefine the kilogram the NIST-4 watt balance
has completed new measurements of Planck’s constant. The value of h being
6.62606983 x 10–34 kg.m2/s with an uncertainty of plus or minus 22 on the last