Jefferson Davis becomes the president of the Confederacy, Pluto is discovered, a cow flies, the first Church of Scientology is formed, the Chicago Seven are found not guilty, and Dale Earnhardt dies at the Daytona 500, all on this day.
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NASA
1977: The space shuttle Enterprise test vehicle is carried on its maiden "flight" on top of a Boeing 747 to measure structural loads, ground handling and braking characteristics.