Charles Darwin publishes his theory of evolution, the NFL is founded, Lou Gehrig belts his 23rd career grand slam and NASA heads for Mars, all on this day.
1775: The Spanish establish the Presidio San Augustin del Tucson in the town that will become Tucson, Ariz.
Earth Day is April 22nd. How much do you know about the items you assumably recycle every day? Find out which ones are recyclable and which ones are not.