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TIL that a theory is not a theorem. A THEOREM is a statement of fact, that can be logically proven using a set of axioms (baseline assumptions about what’s true). A THEORY is an idea about how the world works, and cannot be proven – it can only be tested.

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BADr TIL of retronyms, words created to differentiate between two words, where previously no clarification was required, like acoustic guitar.
R7aY1 TIL of No Kum-Sok, a North Korean pilot who defected to South Korea by flying his MiG-15 near-supersonic across the border. After nearly crashing into an F-86 while landing, he taxied, parked his plane, exited and began tearing a picture of Kim Il-Sung.
OGEY6 TIL Mount Rushmore construction was completed on Halloween (October 31, 1941)
LkMn9 TIL Terry Crews received a scholarship to attend the Interlochen Center for the Arts in Michigan, a prestigious art school. His first job in entertainment was drawing courtroom sketches for the worst murder case in Flint, Michigan history. The murder who had killed six people was also named Terry.
pYOn4 TIL that in 1984 the San Francisco Giants introduced an "anti'mascot" named Crazy Crab which was so disliked that the costume had to be reinforced with fiberglass shell for safety, due to fans pelting it with beer bottles and batteries.