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TIL about the key distinction between “proximate” and “ultimate” analyses in biology & psychology

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KOA7R TIL that Arizona started issuing licenses that were good until age 60. Starting at 65, drivers must renew every five years, with a vision test each time.
gQoD TIL there is a super rare blood type called RH Null that only around 10-40 people in the world have.
6EZ0l TIL in 1940, a 14 year old Fidel Castro wrote a letter to U.S. President Franklin D. Roosevelt asking "If you like, give me a ten dollars bill green American, in the letter, because never, I have not seen a ten dollars bill green American and I would like to have one of them."
woGbP TIL In Cheongju, South Korea, a gang of thieves rented a hotel and spent a month digging a secret tunnel to gain access to a nearby oil pipeline in order to siphon it. They've managed to dug 10 meters deep and reached the pipeline, but a police raid caught them before they could steal any oil.
0dAMy TIL that the lowest recorded Gallup Poll presidential approval rating is from Harry Truman, who reached 22% during the Korean War. This was due in large part to Truman deciding to relieve General Douglas MacArthur of command due to his desire to use nuclear weapons to win the war.