April 16, 1972; Apollo 16 is launched from Cape Canaveral. It was the fifth of six successful lunar landing missions.
April 21, 1918; the German flying ace, Manfred von Richthoven, known as the Red Baron, is killed by enemy fire. At the time of his death he had 80 victories to his credit.
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http://en.wikipedia.org/wiki/Manfred_von_Richthofen
April 23, 1564: William Shakespeare, English playwright and actor is born.
http://en.wikipedia.org/wiki/William_Shakespeare