Lise Mietner
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She began in the early 20th century, and it was a rarity. After she became the 2nd women to earn a PhD in physics, she could only find things to do with science as an unpaid assistant. She wasn’t allowed to work with males in science at all. She worked closely with Otto Hahn, with who she co-discovered protactinium in 1917. In 1923 she discovered two-electron radiation less transition's. In 1938 she worked with her nephew to explain the splitting of the atom (nuclear fission). She won the Nobel Prize for Chemistry in 1944.