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TIL oranges and human vaginas are about the same acidity. Oranges are typically between 3.7 and 4.3 PH and the human vagina typically varies between 3.8 and 4.2 PH

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oReKR TIL Neil Armstrong and Buzz Aldrin's final task on the moon was to leave a small package of memorial items to Soviet cosmonauts Yuri Gagarin and Vladimir Komarov, and Apollo 1 astronauts Grissom, White and Chaffee.
rNme TIL a much higher percentage of astronauts wear corrective glasses in space, while fewer wear them on earth. The lack of gravity affects the shape of the eye.
DpwV TIL in 2002, a mid-air collision between a passenger jet and cargo jet took the lives of all 71 people aboard both planes. A man whose family was killed in the collision later stabbed to death the Air Traffic Controller that was on duty at the time of the collision.
78Ajp TIL that most airlines never use a flight number again if that flight has a fatal crash, except for American Airlines, which keeps using flight #1 despite three major crashes.
x6Xjw TIL In 16th - 17th century Europe and America, the concept of 'bundling' was widely used. This process allowed courting couples to share a bed, fully clothed with a 'bundling board' to separate them. This allowed a pair to talk and get to know each other in the safe confines of the girl's house.