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The silicon spheres for the Avogadro project were polished by a single Australian guy. From Wikipedia (http://en.wikipedia.org/wiki/Kilogram#Avogadro_project h
by alixaxel 13y ago
The silicon spheres for the Avogadro project were polished by a single Australian guy.
From Wikipedia (http://en.wikipedia.org/wiki/Kilogram#Avogadro_project http://en.wikipedia.org/wiki/Kilogram#Avogadro_project):
These spheres are among the roundest man-made objects in the world. If the best of these spheres were scaled to the size of Earth, its high point—a continent-size area—would rise to a maximum elevation of 2.4 meters above "sea level".
^ that IS impressive ^