Enrico Fermi was a renowned physicist who made significant contributions to the field of nuclear physics. He became somewhat cynical of the human race towards the end of his life and had the insight to use neutrons instead of charged particles to induce radioactivity.
Enrico Fermi had the insight to use newly discovered neutrons as a bombarding particle instead of charged particles for artificial radioactive materials. His theory on beta decay has only been improved on and has lasted for decades.
J. Robert Oppenheimer's legacy as the architect of the nuclear age is tragic, as some of his work has led to potentially the destruction of the human species. He believed that theory should be closely related to experiments and his new information had to do with really understanding nuclear physics.
Enrico Fermi, a renowned physicist, became cynical about human progress at the end of his life, having witnessed the development of the hydrogen bomb and the escalating tensions between the US and the Soviet Union that seemed endless, leading to a melancholic sadness about our future.