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TIL: The USA Declared the Marianas trench a National monument

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7r9NM TIL children who sucked their thumbs or bit their nails were 33 percent less likely to react to common allergens. By age 32, it is even higher at 39 percent. The reason: Scientists say these kids built immunity to various bacteria at a young age.
VB0mB TIL we still don’t know why more boys are born than girls. Some theories include the notion, it’s more dangerous to be a male, thus you need extra males. Other research suggest living through wars gives rise to males.
ZpxXa TIL Before toilet paper, people used corn husks, sea sponges, and even a scraping technique with seashells after using the bathroom.
4X5AX TIL that comedian Fred Armisen's parents were born in Venezuela and in Germany. His grandfather though was Korean who adopted a Japanese name after the Kantō massacre of Koreans in 1923. He became a dancer, and while working for Nazi Germany during WW2, was a spy for the Empire of Japan in Europe
lv5 TIL - Black Widow bites produce muscle aches, nausea, and a paralysis of the diaphragm that can make breathing difficult; however, contrary to popular belief, most people who are bitten suffer no serious damage—let alone death.