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Electromechanical Computers   Howard Aiken: The Harvard/IBM Mark I (1943) 1941 Japan attacks Pearl Harbor. 1941 The National Gallery of Art opens in Washington, D.C. 1945 Atomic Bombs dropped on Hiroshima and Nagasaki, Japan. 1947 Jackie Robinson becomes the first African_american player in major league baseball. Photograph of the Mark 1 computer, reproduced with permission from the Harvard News Office, Harvard University. Photograph of Grace Hopper, copyright U.S. Navy Photograph of Howard Aiken, Harvard University Gazette Archives World War II photographs, courtesy of National Archives and Records Administration (NARA). Illustration of rug, courtesy of Jacobsen's Rugs http://www.jacobsenrugs.com Posters, copyright Smithsonian Institution  Ann Jenkins