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TIL that oysters make pearls when an irritant enters their mouth and they deposit a mineral to coat the irritant and make it more bearable, forming a pearl.

Read more animals.howstuffworks.com

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GY504 TIL the Korean Demilitarized Zone (DMZ) separating North and South Korea has become a unintentional nature preserve. Several rare and endangered species, including the Amur leopard and Siberian tiger have been spotted there.
9wJXB TIL that in Ancient Rome, oral sex in general was seen as somewhat disgusting...and forcing a man to orally fellate another was an appropriate punishment for adultery
wLQJJ TIL: There is a thing as "smoking jacket" which is worn to prevent the tobacco smell from sticking on your clothes.
xVX4k TIL that plastic fibers have been found in tap water around the world, with the US at the worst rate (94%), and both the exact sources and the health consequences are yet unknown.
LkAVp TIL researchers found a mother dolphin who adopted a young melon-headed whale; the dolphin mother nursed the whale who often pushed his "adoptive sister" away from the mother. The whale took on bottlenose behaviors such as surfing, jumping, & socializing with other young males.