- Otto Hahn was born in Germany¹

- Hahn obtained his doctorate from the University of Marburg where he later became a professor¹

- Studied radioactivity in London, England¹

- Returned from Canada where Hahn had been studying with Ernest Rutherford¹

- Began working with Lise Meitner at the Kaiser Wilhelm Institute for Chemistry (now the Max Planck Institute)¹

- World War One broke out and Hahn's knowledge led to the use of chlorine and mustard gas¹

- Hahn and Meitner discovered Proactinium¹

- Hahn and Meitner discovered nuclear isomers¹

- Hahn and Meitner were joined by a brilliant assistant, Fritz Strassmann¹

- After Hahn had Meitner "sent away" from Germany, he wrote her and her nephew about some odd experimental results that him and Strassmann had seen occur, which Meitner wrote back to, explaining what they had found was nuclear fission (Frisch, Meitner's nephew, coined this term as he thought it looked like what happens when bacteria divide, which is called fission³)

- Hahn as well as other notable scientists such as Heisenburg were questioned about their involvement in nuclear weapons during the Second World War by the Allies^1,2