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TIL That a rat king is a collection of rats who’s tails have been intertwined and bound together. They grow together and eat together and sometimes when one of them dies they eat it together. There can be up to 32 rats in one rat king.

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7JKP TIL that the idiom “the cat’s out of the bag” is derived from a practice by some merchants who sold piglets in bags. If the buyer was distracted, the merchant would quickly switch the piglet w/ a cat. The buyer wouldn’t realize until they got home and let the cat, and not a piglet, out of the bag.
4kBEN TIL in 1945 Ireland's president and prime minister both offered official condolences to Germany upon the death of Hitler. They were the only Western European democracy to do so.
E1EPw TIL France and Spain have a timeshare called Pheasant Island. They alternate ownership every six months.
MeQQa TIL Lactose Tolerance developed in humans only 10,000 yrs ago with domestication of animals. Most people worldwide are still Lactose Intolerant.
ZwyQ TIL that the Rhinoceros Party was a registered party in Canada led by Cornelius, a rhinoceros, and promised to repeal the law of gravity and change Canada’s currency to bubble gum, so it could be inflated or deflated at will.