1900
*Photo of Sigmund Freud courtesy of the Sigmund Freud Museum, Vienna, Austria
http://freud.t0.or.at

1903
Photo of the Wright brothers courtesy of the University of Maryland
http://www.wam.umd.edu

1905
*Photo of Albert Einstein courtesy of the Albert Einstein College of Medicine of Yeshiva University
http://www.aecom.yu.edu

1914
Photo of the opening of the Panama Canal courtesy of America Hurrah
http://www.americahurrah.com

1927
*Photo of Charles Lindbergh 1928 Photo of Alexander Fleming courtesy of the University of Illinois at Urbana-Champaign
http://www.uiuc.edu

Photo of television camera tube courtesy of the Early Television Foundation
http://www.earlytelevision.org

1930
*Photo of Ernest O. Lawrence
http://www.mnc.net

1932
*Photo of Amelia Earhart courtesy of The National Women's Hall of Fame
http://www.greatwomen.org

*Images pending approval.

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