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TIL that Hiroshima and Nagasaki were the two largest center's of Christian population in Japan during WWII. The atomic bombing in Nagasaki killed 66% of the Christians in the city.

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M7VkV TIL While on the Moon, astronauts did not have any data to tell how long the small water tank used for cooling in their backpacks would last. After returning to and repressurizing the Lunar Module, they could drain and measure remaining water in the backpacks to confirm the predicted
QJV7p TIL that Vanderbilt University, founded in 1873, is named in honor of Cornelius Vanderbilt, who provided the school its initial $1-million endowment and hoped that his gift and the work of the university would help to heal the sectional wounds inflicted on the American nation by the Civil War.
e0VeJ TIL that wisdom tooth extraction is a $3 billion per year industry in the USA. As many as 70% of wisdom teeth extractions are unnecessary, and that stopping these unnecessary extractions would reduce the average yearly income of an American dentist by as much as 40%.
5Yjop TIL that for many years prior to the Crusades, Muslims, Jews, and Christians worked together to translate and reproduce Ancient Greek texts, like Aristotle, to reintroduce lost literature to the world.
WkPeX TIL the Simpsons softball episode is credited with saving at least two lives.