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TIL about Hijra, a historically-accepted third gender in South Asia

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rNWg4 TIL before the invention of the American football helmet in the 1890s, players would often grow their hair long because they believed it protected them from head injuries.
E1GOX TIL Royal Bank of Canada provided $3M in funding to expand artificial intelligence and data analytics programs, with a focus on answering big questions for the good of society
K0n9 TIL Airmail pilots in the 1920’s used a network of 70-foot concrete arrows to navigate cross country flights. These arrows are still around today.
ngkW TIL: In the 1940s, a psychoanalyst named Rene Spitz found that it’s far better for a child’s well-being to be raised in prison by their real mothers than to be raised as orphans in hospitals.
4dNN TIL Mario wears a hat because programmers found it difficult to create the hair movement that would occur when the character jumped.