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TIL many neurologists believe that the phaseout of leaded gasoline in the United States caused the average IQ to increase by several points.

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j69pj TIL That up until the 1970s there existed a law in Ireland in which all bars had to close...on March 17.
4XerN TIL that an 18-year-old girl called Rae Heim ran across America almost entirely barefoot. She only wore shoes on some hard terrain. She ran 3,437.5 miles in 8 months and raised more than $10,000 for charity. She started running barefoot at 16 after breaking a big toe, and kept it up after it healed.
Oo5y6 TIL In 637 AD, Chinese pilgrim Xuanzang visited Nalanda university. He saw that it had 10,000 students from all over the world and around 2000 teachers Mahayana, Vedas, Shastras, Sankhya, Medicine, Linguistics, Etymology, Economics, Weaponry and Archery was taught to the students.
7n1X TIL that ~83% of Jewish Americans support same-sex marriage, far surpassing the national average of 55% and the 72% of the 18-39 year old demographic.
X0OwE TIL the last American Civil War widow died in 2020. Helen Viola Jackson was 17 when she married 93 year old veteran James Bolin. They married so that the Jackson would be eligible for Bolin's pension after the teenager helped the elderly Bolin with chores. Jackson never applied for the pension.