Ève Curie - Madame Curie (1936)

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The radiation of radium was "contagious"-Contagious like a persistent scent or a disease. It was impossible for an object, a plant, an animal or a person to be left near a tube of radium without immediately acquiring a notable "activity" which a sensitive apparatus could detect.

Ève Curie

By definition, a chemist only believes in the existence of a new substance when he has seen the substance, touched it, weighed and examined it, confronted it with acids, bottled it, and when he has determined its "atomic weight."

Ève Curie

Thus the radio elements formed strange and cruel families in which each member was created by spontaneous transformation of the mother substance: radium was a "descendant" of uranium, polonium a descendant of radium.

Ève Curie