› added 2 years ago

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TIL that cats have hundreds of tiny 'mini claws' or 'hooks' called papillae on their tongue made out of keratin. This is the same stuff their claws are made from and that's why a cats tongue feels so rough.

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9YDDp Today I learned, that our future is in space.
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0pJM TIL The population of Detroit is now less than half of what it was in 1940. Main reasons include high levels of crime and the failure of the automobile industry.
vWyr TIL on the island of Yap they use giant stone disks as currency. Instead of moving the stones, they trade them by agreeing that a stone has a new owner. In fact, when one stone fell into the ocean, people continued to trade the stone despite it being underwater and inaccessible.
VlZG TIL Japanese knotweed is listed by the World Conservation Union as one of the world’s worst invasive species. It damages concrete foundations, buildings, flood defences, roads and architectural sites. In 2010, the UK released into the wild a Japanese insect that feeds on Japanese knotweed.