February 22, 1980: In what became known as the "Miracle on Ice," the United States men's ice hockey team—made up entirely of amateur and collegiate players—defeated the heavily favored, four-time defending gold-medalist Soviet Union team at the Winter Olympics in Lake Placid. It remains one of the greatest upsets in sports history.

February 22, 1997: Scientists at the Roslin Institute in Scotland blew the world's mind when they announced they had successfully cloned an adult mammal for the first time in history: Dolly the sheep.

February 22, 1879: Frank Woolworth opened the first "Great 5¢ Store" in Utica, New York. It pioneered the concept of a discount store where consumers could handle the merchandise themselves without asking a clerk, changing retail forever.

Bananas are slightly radioactive. They contain potassium, and a very small fraction of naturally occurring potassium is a radioactive isotope called potassium-40. Don't worry, though—you would have to eat tens of millions of bananas in a single sitting for it to actually harm you!

Oxford University is older than the Aztec Empire. The famous university in England has evidence of teaching dating as far back as 1096. The Aztec city of Tenochtitlán (now Mexico City) wasn't founded until 1325.