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TIL Finches and canaries were used in the coal mine industry to detect carbon monoxide. This practice ceased as of 1986

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kO8nd TIL "chicken sexers" are experts who can identify a chick's gender in about 3 seconds – over 1,000 birds per hour. Studying for this at the "Zen-Nippon Chick Sexing School" takes 2 years.
R7Ovl TIL that monkeys in Japan learned to wash sweet potatoes in fresh water to clean them. They later switched to washing sweet potatoes in salt water. It is theorized that this is because they like the salty taste more than plain potatoes.
ORB1 TIL the creators of Pac-Man did not now how the game ended as it was designed to run indefinitely. It was only when Billy Mitchell finished the game, after all its internal storage ran out, that they saw how it ended.
JMB8 TIL 3 of Adolf Hitler’s cousins live quietly in Long Island New York. None of them have children and it is rumored that they refuse to have children so the family line with die with them.
QN9Rd TIL that Spam is seen as a luxury food in South Korea due to smuggling during Korean War from U.S. army base