Jewish culture and many Jewish scientists had a significant role in the project. The theoretical physicist Robert Oppenheimer, often considered as the ""father of the atomic bomb"", was chosen to direct the Manhattan Project at Los Alamos National Laboratory in 1942. The physicist Leó Szilárd, that conceived the nuclear chain reaction; Edward Teller, ""the father of the hydrogen bomb"" and Stanislaw Ulam; Eugene Wigner contributed to theory of Atomic nucleus and Elementary particle; Hans Bethe whose work included Stellar nucleosynthesis and was head of the Theoretical Division at the secret Los Alamos laboratory; Richard Feynman, Niels Bohr, Victor Weisskopf and Joseph Rotblat.
Timeline of the nuclear program of Iran "no evidence" that Iran is attempting to build an atomic bomb. November 13, 2003: The Bush administration claims that the IAEA conclusion of "no evidence" is "impossible to believe." December 18, 2003: As agreed in the Paris Agreement, Iran voluntarily signs and implements the Additional Protocol to the Nuclear Non-Proliferation Treaty Though the Protocol was not binding on Iran until ratified, Iran voluntarily agrees to permit expanded and more intensive IAEA inspections pursuant to the Protocol, which fail to turn up a nuclear weapons program in Iran. Iran ends the voluntary implementation of Additional Protocol after two years of inspections,