jan 1, 1927 - Source
Description:
The Editors of Encyclopædia Britannica. “Uncertainty Principle.” Encyclopædia Britannica, Encyclopædia Britannica, Inc., 18 Apr. 2017, www.britannica.com/science/uncertainty-principle.
Added to timeline:
Atom Theory History - Thomas Evenson
Pre-AP Chemistry, 2nd period, Pope
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