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1920s ‘Little Albert experiment.’ Johns Hopkins University chose a nine-month-old infant from a hospital and attempted to ‘condition a phobia in an emotionally stable child.’ They successfully made him fear Santa, rabbits, and other furry animals.

A woman named Anneliese Michel went through 67 exorcism sessions; one or two each week, lasting up to 4 hours that were performed over about 10 months between 1975 and 1976. After her death, investigation determined that she was malnourished and dehydrated. Her parents and the priests responsible were charged with homicide.

The waffled style ice cream cone, hamburgers, hot dogs, iced tea, cotton candy, and Dr. Pepper, were all first introduced to mass audiences or popularized at the 1904 St. Louis World's Fair.

"North Star" or the Polaris is actually a set of three stars orbiting each other.

If the Sun was scaled down to the size of a white blood cell then the Milky Way would be the size of the continental United States.