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- 1904 - J. Robert Oppenheimer, an American theoretical physicist, was born on this day. Oppenheimer is best known for his role as the director of the Manhattan Project, the World War II effort to develop the first nuclear weapons.
- 1915 - The use of poison gas in World War I escalated when chlorine was released as a chemical weapon in the Second Battle of Ypres.
- 1970 - The first Earth day or environmental teach-in was called for by Gaylord Nelson, a United States Senator from Wisconsin. Over 20 million people participated that year, and Earth Day is now celebrated annually on April 22.
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