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TIL Taffy Nivert and Bill Danoff, two of the lead singers for Starland Vocal Band (Afternoon Delight), were writing "Take Me Home, Country Roads" and planned to sell it to Johnny Cash, but during a tour with John Denver the three finished the song, which became Denver's signature hit.

A7nw TIL that the solution of the Monty Hall problem (that asks to pick one of three doors to win a car, the picked door remains closed and the third one opens, then asks if you want to switch or not) is so counterintuitive that mathematician Paul Erdos was unconvinced until he saw a simulation of it
9Yrbp TIL that there were more ancient capitals of Russia (though the country had another name then) and that scientists don't know which of two cities, Staraya Ladoga or Velikiy Novgorod, was really the capital. But what's more interesting is that you can see what archeologists have dig out at the both!
neRKG TIL that the total mass of the entire asteroid belt is only about 4% of the mass of Earth's Moon
b6L4 TIL that Martin Luther wrote a 65,000 word antisemitic treatise called “On the Jews and Their Lies,” which states that Jews are “full of the devil’s feces…which they wallow in like swine,” and that their synagogue is “an incorrigible whore and an evil slut.”
gMXVb TIL The wreck of Titanic's is disappearing at a rate that it's estimated to be completely gone in about 30 years. A microorganism called 'Halomonas titanicae' (also called the 'steel-munching bacteria') is slowly eating away the iron of the ships' wreck, causing its deterioration.