17 feb 1898 año - Marie and Pierre Curie discover that thorium gives off "uranium rays," which Marie renames "radioactivity." Marie and Pierre Curie discover polonium and announce the existence of another new radioactive element they name radium. Paul Ulrich Villard

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- discover that thorium gives off "uranium rays," which Marie renames "radioactivity."
- discover polonium and announce the existence of another new radioactive element they
name radium.
- discovers gamma rays.

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