Visit of scientists who took part in the original Fermi Experiment, 1942, 5:30PM. President John F. Kennedy visits with a group of scientists involved in the original Enrico Fermi experiment, conducted as part of the Manhattan Project in 1942, during a visit marking the 20th anniversary of the experiment. Left to right: professor of atomic and nuclear physics at New York University, Dr. Leona Woods Marshall; Director of Nuclear Weapons Testing for the Atomic Energy Commission (AEC), Dr. Alvin C. Graves; unidentified; former Director of Argonne National Laboratory, Dr. Walter H. Zinn; unidentified; Ambassador of Italy, Sergio Fenoaltea; President Kennedy; unidentified; Robert G. Nobles, of the Argonne National Laboratory; and three unidentified persons. Rose Garden, White House, Washington, D.C. Please see the Presidents appointment book for a full list of attendees.