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TIL Showing male pandas "panda pornography" is credited with recent population boom among pandas in captivity in China.

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DYde TIL that a librarian found smallpox scabs stored inside a 19th century medical book. In the 1800s scabs from infected people would be inserted into healthy people as a means of vaccination. These scabs have the potential to shed light on The evolution of the small pox vaccine used in the Us today.
kJvK1 TIL the earliest description of the heliocentric model dates back to Ancient Greece. Aristarchus of Samos (c.310–c.230 BC) described the Earth spinning on its axis once per day and orbiting a fixed Sun. He also thought that stars were other suns much further away.
E164x TIL that one controversial scene in Hitchcock's Psycho was when Marion flushed the money down the toilet because "no flushing toilet had appeared in mainstream film and television in the United States at that time".
bnpQ TIL the phrase “Give a man a fish, he’ll eat for a day; teach him how to fish, and he’ll eat for a lifetime,” did not come from an ancient Chinese proverb, the Torah, the Bible, or any other such place. It was coined by Anne Isabella Ritchie, the daughter of William Makepeace Thackeray in 1885.
N7nk1 TIL the USA has been placed under Martial Law numerous times. Martial law is military control over all of a country's activities, usually during wartime, an emergency or widespread disaster. In the USA, martial law must be ordered by the president and must be limited to the duration of the event.