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TIL that Black Widow spiders are often hunted down and killed by their Brown Widow cousins when in the same territory.

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R5ob7 TIL Roman culture used pins in foreskins for a variety of reasons, including preserving a man's voice and sexual abstinence
W7jE4 TIL Ford Motor Company made experimental helmets for soldiers in WW1. The Model No. 8 helmet made between 1917 and 1918 weight 3 lbs and looked like a knight helmet.
epDnn TIL about Margaret Ives Abbott the first woman to win a medal in the modern Olympics, and also part of the only mother-daughter pair to compete in one Olympics. Margaret won at golf, her mother, Mary, came in seventh. Coinciding with the Paris Exposition, many were unaware they were in the Olympics.
69EnQ TIL Scrupulosity is an OCD theme in which a person is overly concerned with the fear that they are doing something that goes against their religious beliefs or is immoral.
9wY6M TIL of the 1925 dystopian novel 'Berlin Without Jews'. In the book, a far-right nationalist political party takes power and expels all Jews from Germany, while society at large does nothing to stop them. When Hitler became Chancellor of Germany in 1933, the author committed suicide.