The Differential Analyzer   late 1800s - early 1900s William Thomson (Lord Kelvin): Tide Predictor (1876) Vannevar Bush: The MIT Differential Analyzer (1930) 1920 The Panama Canal officially opens. 1925 Tennessee teacher John Scopes is put on trial for tecahing Darwin's theory of evolution. 1929 The stock market crashes. 1931 CBS inaugurates the first regular schedule of television broadcasting. 1932 Amelia Earhart is the first woman to fly solo across the Atlantic. 1939 The movies Gone with the Wind and The Wizard of Oz are released. Bomb picture, courtesy of Grolier Online, http://www.grolier.com Photo of Vannevar Bush, Differential Analyzer, courtesy of MIT Miseum, http://www-eecs.mit.edu   Brenda Brown