Pieces of the puzzle
- Szilard's idea did not gain traction until 1938, when German physicists Otto Hahn and Fritz Strassman (opponents of the German regime) bombarded uranium atoms with neutrons. They found traces of the element barium in the debris.
- Hahn wrote about it to Austrian chemist Lise Meitner, who explained that the uranium nucleus was splitting into two equal parts - a process named "fission."
- In New York, Italian physicist Enrico Fermi found that uranium fission released secondary neutrons needed to start the chain reaction.
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