The document profiles several prominent scientists involved in early nuclear research and the Manhattan Project, including: - Leo Szilard, a Hungarian-American physicist who is considered one of the first to think seriously about building atomic bombs and worked on the Manhattan Project from start to finish. - Neils Bohr, a Danish physicist who made crucial insights into nuclear fission and the properties of Uranium isotopes. - Enrico Fermi, an Italian physicist who conducted the first nuclear fission experiment and worked on the Manhattan Project, winning the Nobel Prize in 1938. - Albert Einstein, a physicist who co-authored a letter with Szilard warning President Roosevelt about the possibility of nuclear