EVB2948867: Speaker of the House Nicholas Longworth posing for Austrian painter Baron Robert Doblhoff. April 7, 1930. The portrait was commissioned by Beman Gates Dawes, Ohio politician and oil executive. Longworth was the husband of Alice Roosevelt, Theodore Roosevelt oldest daughter / Bridgeman Images
EVB2948005: First nuclear reactor at the University of Chicago achieved the first self-sustaining chain reaction. December 2, 1942. Chicago Pile-1 (CP-1) was built under the direction of physicist Enrico Fermi, in collaboration with Leo Szilard. In 1943 it was dismantled and reassembled at the Palos Park unit of the Argonne National Laboratory. The drawing is by Melvin A. Miller of the Argonne National Laboratory / Bridgeman Images