In 1939 research done by several leading scientists including [[Enrico Fermi]] regarding chain reactions of nuclear fission prompted [[Leo Szilard]] to persuade Einstein to write a letter to President <ref>[[Roosevelt]] [http://hypertextbook.com/eworld/einstein.shtml]</ref>, to warn the President about the possibility of nuclear weapons and that Nazi [[Germany]] had already taken an interest in this technology. | In 1939 research done by several leading scientists including [[Enrico Fermi]] regarding chain reactions of nuclear fission prompted [[Leo Szilard]] to persuade Einstein to write a letter to President <ref>[[Roosevelt]] [http://hypertextbook.com/eworld/einstein.shtml]</ref>, to warn the President about the possibility of nuclear weapons and that Nazi [[Germany]] had already taken an interest in this technology. |