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TIL that rats laugh by "chirping" when playing and when tickled by humans. Rats that laugh the most also play the most and prefer to spend more time with other laughing rats.

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4Z8o TIL Humans’ and Dogs’ brains have evolved to understand each others’ vocalizations to some degree, including dogs understanding human laughter.
4Xb4b TIL that the original XBOX prototype was literally a gigantic X. It was carved out of aluminum and cost $18,000 to manufacture, but you could actually play on it.
aejy TIL of Richard Marcus. A retired casino scammer that earned over 12.000.000$ with a simple roulette trick and never got arrested for it.
grPE7 TIL in 1956, the U.S. Air Force attempted but were unable to shoot down a runaway drone in southern California. All their rockets fell, causing large brushfires and damaging homes and vehicles in the city of Palmdale. 1,000 acres (400 ha) were burned. It became known as the "Battle of Palmdale".
dAM8 TIL Morgan Freeman said the concept of a month dedicated to black history is “ridiculous”: “I don’t want a black history month. Black history is American history.”