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TIL the frequency of a cricket's chirps is consistent with air temperature, count how many chirps there are over 25 seconds then divide by 3 and add 4 to tell you the temperature in Celsius.

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Meb8A TIL that rats were thought to be carriers of the bubonic plague and that in Sydney, around 200,000 rats were caught to eliminate the disease.
5bkD TIL, The ammount of Vermouth in a martini has gone from a 2:1 ratio to so little it has been quoted, “A perfect Martini should be made by filling a glass with gin, then waving it in the general direction of Italy,” Italy being a major producer of vermouth.
bxPE TIL Patrick Stewart was initially considered for the role of Data in Star Trek the Next Generation. Roddenberry did not want to cast Stewart as Picard, since he had envisioned an actor who was “masculine, virile, and had a lot of hair”.
b6j6N TIL about a 747 hijacking where the jet had to land in Algeria to refuel. The lead flight attendant actually had to buy 6,000 gallons of jet fuel on her personal credit card because the Algerians insisted on payment first
VBYKk TIL that an average of 2 amputations occur weekly at US meatpacking plants.