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TIL Joseph Armand Bombardier invented the snowmobile after his son died of appendicitis when a blizzard prevented him from getting him to a hospital in time.

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OG7P1 TIL that rats emit high-pitched squeaks that are considered their "laughter", which are out of the range of human hearing, in response to being tickled.
x5n0 TIL that the longest game of chess, theoretical, is 5949 moves.
57jn TIL that a series of experiments by psychologists at the University of California Berkeley and the University of Toronto showed that upper class people are less charitable and more likely to cheat.
YPv TIL there are twice as many men with an IQ of 120-plus as there are women and there are 30 times the number of men with an IQ of 170-plus as there are women.
d8olr TIL the Lockheed U-2 spy plane, famous for conducting covert reconnaissance during the Cold War, is still in active service after 65 years, being used for military and scientific missions.