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TIL that we start forgetting early childhood memories at around age 7

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RGba TIL that a chimpanzee has been observed wearing a piece of grass into her ear, with no apparent function. After other members of her group started imitating her, researchers realised to be in presence of the first fashion statement observed in other animals.
YpdmB TIL that Lars Larsen, late owner of Jysk (a Dutch furniture company) has sent a free copy of his self-published book to every Danish household, and thus, effectively made it the number one book in Denmark.
v1M6B TIL of William Burke, a Scottish murderer who would sell corpses for a profit to medical researchers. After he was hanged for his crimes, scientists dissected him, wrote with his blood, and bound a book with his skin.
xDwg TIL the world population growth rate is decreasing and total world population could start declining around the year 2100, according to the UN.
5odr TIL that a gallon of gasoline has 31,000,000 calories.