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A comment on Physicists Detect Gravitational Waves, Proving Einstein Right. Parent comment

Re:Physicists Detect Gravitational Waves, Proving Einstein R... by xdarnold on Thursday February 11, 2016 @10:09PM (#11085045)
With today's technology, for some compounds... you can count atoms by physical measurements and known structure, and figure mass by atomic weight.

http://www.nist.gov/pml/si-redef/kg_new_silicon.cfm

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