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TIL in 1973, a Harvard astrophysicist suggested that we won't discover more advanced civilizations because they don't want us to find them and have the technology to ensure we never do. They have also set aside our planet as a zoo wherein they can observe us. He coined this idea the Zoo Hypothesis.

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GY1BN TIL on April Fools’ Day 1997, Alex Trebek and Pat Sajak traded places. Pat Sajak hosted Jeopardy! and Alex Trebek hosted Wheel of Fortune with Sajak’s wife, Lesly, as Trebek’s co-host. Sajak and Vanna White played contestants at the wheel, with winnings going toward charities.
X0e9E TIL, Robert Patrick, the actor of the Terminator 2 T-1000 graduated from Farmington High School in Farmington, Michigan, and he previously didn't like acting in childhood, one of the reasons was because he refused to wear green tights for a Robin Hood play.
Y7OPr TIL that there are two sequels to the novel “Little Women”; the first is called “Little Men”, and the second is called “Jo’s Boys”. Both novels focus on the two sons of the character of Jo from “Little Women”.
4J6w TIL during the Battle of the Bulge, American MPs trying to uncover German infiltrators would ask soldiers questions that every American should know. General Omar Bradley was briefly detained after he “incorrectly” identified Springfield as the capital of Illinois. The MP thought it was Chicago.
NAJP TIL when asked what his inspiration was for the Funkadelic album “Free Your Mind…and Your Ass Will Follow”, George Clinton said it was an attempt to “see if we can cut a whole album while we’re all tripping on acid.”