March 13th in history:
Attorney Clarence Darrow, the defense lawyer at the Scopes “Monkey” trial, died on this date in 1938. It was exactly 13 years after the day the Tennessee House voted to ban the teaching of evolution in state schools. Passage of that law led to the Scopes trial.
A major scientific discovery on March 13th, 1781: Astronomer William Herschel announced that he had found the planet Uranus. It was the first planet in the solar system to be discovered by telescope.
And on this date in 1930, astronomer Clyde Tombaugh announced to the Harvard College Observatory that he had discovered a ninth planet, which would be named Pluto. In 2006, Pluto was downgraded to the status of “dwarf planet.”