The development of the new science has constantly continued to follow an upward course.The development of the new science has constantly continued to follow an upward course.

— Marie Curie

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This method has come into general application, and is similar in some ways to spectral analysis.This method has come into general application, and is similar in some ways to spectral analysis.

— Marie Curie

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In the case of radium isolation was completely successful but required several years of unremitting effort.In the case of radium isolation was completely successful but required several years of unremitting effort.

— Marie Curie

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This conviction was based solely on the atomic nature of radioactivity.This conviction was based solely on the atomic nature of radioactivity.

— Marie Curie

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From that time onward numerous scientists devoted themselves to the study of radioactivity.From that time onward numerous scientists devoted themselves to the study of radioactivity.

— Marie Curie

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To obtain a very pure salt I have had to perform several thousands of crystallizations.To obtain a very pure salt I have had to perform several thousands of crystallizations.

— Marie Curie

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The radium spectrum is very precisely known.The radium spectrum is very precisely known.

— Marie Curie

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We were convinced that the materials which we had discovered were new chemical elements.We were convinced that the materials which we had discovered were new chemical elements.

— Marie Curie

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We were thus led to create a new method of searching for new elements.We were thus led to create a new method of searching for new elements.

— Marie Curie

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It was obvious that a new science was in course of development.It was obvious that a new science was in course of development.

— Marie Curie

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