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TIL that three of the four presidents on Mt. Rushmore (Washington, Jefferson, and Lincoln) worked as land surveyors before starting their political careers

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yVLjX TIL that Operation Denver was an active measure disinformation campaign run by the KGB in the 1980s to plant the idea that the United States had invented HIV/AIDS as part of a biological weapons research project at Fort Detrick, Maryland.
Lk1r TIL the average human being normally does not swallow any spiders in their lifetime, contrary to popular belief of eight spiders per year.
7xwP TIL that the oldest living tree is 4,765 years old and lives in a secret location.
wolx8 TIL that Dan Quayle, Vice President of the U.S. (1989-1993) corrected a student's spelling of "potato" to "potatoe" in a spelling bee.
mQgO TIL that Kelsey Grammer expected to play Sideshow Bob only once on ‘The Simpsons’. Although the actor does not like performing the character’s evil laugh, Grammer says that Bob is the most popular character he has ever played, even more than Frasier Crane.