January 31, 1917 Lise Meitner and Otto Hahn discover a radioactive element called proactinium

January 31, -1917- Otto Hahn and Lise Meitner, German scientists, discover a radioactive element called proactinium.

Lise Meitner was an Austrian physicist who researched radioactivity and nuclear physics. Meitner was an important part of the team that discovered nuclear fission, an achievement for which her colleague Otto Hahn received the Nobel Prize. She is often considered one of the most blatant examples of scientific breakthroughs made by women and overlooked by the Nobel committee. A study published in 1997 in the journal Physics Today concluded that Meitner's omission was "a rare example in which negative personal opinions apparently led to the exclusion of a deserving scientist." Element #109, meitnerium, was named in his honor.

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