On July 20, 1925, the trial of John Scopes continued in the stifling heat of the overcrowded county courthouse in Dayton, Tennessee. Tempers flared as the defense and prosecution sparred over the question of admitting testimony from scientific experts.

The heat became too much to bear, and the judge announced that he was moving the trial outside. Some 3,000 spectators and reporters gathered on the courthouse lawn. Defense lawyer Clarence Darrow shocked the crowd by calling a surprise witness to the stand, in a last-ditch effort to undermine the fundamentalist movement once and for all.

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