Word: collonium
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...Boston and to Harvard, went on to speak of her work, and that of her husband, Professor Pierre Curie. Twenty-five years ago, he said, patient experimentation with uranium which was known to have the property of radio-activity, led to their discovery of two new elements, radium and collonium, which have this property in far greater degree. Then the realization that radium had an immediate medicinal value through its destructive effect on malignant organic growth, made theirs a priceless discovery...
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