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TIL about Ann Hodges the only known person to have been struck by a meteorite and survived

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GY8MG TIL There are an estimated 40 quadrillion black holes in the observable universe.
yQyXl TIL that the most prolific mathematician in history, Paul Erdos, took amphetamines for the last 30 years of his life to fuel 18 hour working days. Once he was challenged to stay off the Benzedrine for a month - he succeeded but said “Mathematics has now been set back a whole month.”
69gel TIL Parmesan cheese is technically only parmesan if it comes from one of 5 specific parts of Italy.
ANmW7 TIL that YouTube originally launched as a dating site.
4k6a5 TIL Alice Hamilton was the first woman appointed to the Harvard University faculty in any field. During her years at Harvard (1919-1935), she never received a faculty promotion. She was excluded from social activities, could not enter the Harvard Union, or attend the Faculty Club.