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Today I Learned that barber shops were once considered incredibly disreputable and doubled as gambling dens

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RJ98 TIL “hedgehog’s dilemma” describes hedgehogs’ inability to cuddle for warmth due to their spikes, and is a metaphor for the challenges of human intimacy.
JYKxm TIL There are more captive tigers in the USA (5000-10000) than there are remaining in the wild (3,900).
6EPaJ TIL crows in urban Japan and the United States have innovated a technique to crack hard-shelled nuts by dropping them onto crosswalks and letting them be run over and cracked by cars. Then they retrieve the cracked nuts when the cars are stopped at the red light.
nWDAW TIL the vampire squid is neither an octopus nor a squid and it's eyes are proportionately the largest in the animal kingdom. If agitated, it ejects a sticky cloud of bioluminescent mucus which is able to stick to predators, making them more visible to secondary predators
yQBMM TIL In 2015 a new species of damselfly was discovered in Africa. The scientists who discovered it ended up naming the new species Umma gumma after Pink Floyd's 1969 experimental album Ummagumma.