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Warren Harding Presidency
Warren Harding becomes the 29th president of the United States. -
Traffic Lights are Invented
William Potts, a police officer, invents the modern traffic light. It was first installed at a corner in Detroit. -
Calvin Coolidge Presidency
Calvin Coolidge becomes the 30th president of the United States. -
Television is Invented
Philo Farnsworth, a simple farmboy, invented and patented the television, changing the way the world would work. -
Penicillin is Invented
Dr. Alexander Fleming invented Penicillin while experimenting on the influenza virus and mold. It was not used on a patient until 1943. -
Herbert Hoover Presidency
Herbert Hoover becomes the 31st president of the United States. -
Franklin Roosevelt Presidency
Franklin Roosevelt becomes the 32nd president of the United States. -
The Digital Computer is Invented
George Stibitz invented the first digital computer to calculate binary addition. -
World War II Begins
The second world war began when Germany invaded Poland and Great Britain and France declared war on Germany.