https://rinconeducativo.org/en/anniversaries/january-7-1939-marguerite-perey-observes-anomalous-radiation-actinium-attributes-new-chemical-element/
January 7, 1939 - Marguerite Perey observes an anomalous radiation in actinium which she attributes...
Oct 15, 2024 - January 7, 1939 - Marguerite Perey observes an anomalous radiation in actinium which she attributes to a new chemical element.
marguerite pereyjanuaryobservesanomalousradiation
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