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TIL the Pope was not officially declared infallible until the 1st Vatican Council in 1870

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d8kk9 TIL The word facetious contains all five vowels in alphabetical order.
VBm4Q TIL Ketchup originated in China as a fermented fish sauce called "ke-chiap". The version we know today with tomatoes only came about in the 18th century.
GdBJ TIL the optimal strategy of finding a good partner is to reject the first 37% of potentials, and then pick the first person better than anyone seen so far
bZLE TIL that after needing 13 liters of blood for a surgery at the age of 13, a man named James Harrison pledged to donate blood once he turned 18. It was discovered that his blood contained a rare antigen which cured Rhesus disease. He has donated blood a record 1,000 times and saved 2,000,000 lives.
x69gw TIL in the 1980s millions used the Walkman during exercise helping to mark the beginning of the aerobics craze. During the height of the Walkman's popularity, between 1987-1997, the number of people who reported that they walked for exercise rose by 30%.