Statement of Significance (as of designation - December 21, 1965):
On February 23-24, 1941, in this small research laboratory at the University of California at Berkeley, the man-made element Plutonium was first identified. Had it not been for that momentous discovery at this site, neither the atomic explosives used in 1945 to end the War with Japan, nor the subsequent development of nuclear energy reactors would have been possible.
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