April 20th in history:
The Red Baron shot down his last two targets on April 20th, 1918. Baron von Richthofen was shot down himself the next day, while pursuing a Sopwith Camel flown by a Canadian pilot.
Silent movie star Harold Lloyd, known for performing stunts at dizzying heights, was born on this day in 1893.
And on April 20th, 1926, Warner Brothers and Western Electric announced a method for providing sound to motion pictures. It was called the “Vitaphone.”