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TIL Horseshoe crabs have existed for around 450 million years, and soil itself first appeared on earth 450 million years ago, meaning that horseshoe crabs are literally as old as dirt.

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5YyZn TIL about Men’s Mental Health—How It Affects Modern Men In 2020 [Constructive Guide]
GY861 TIL: Large amounts of stored pistachios are prone to spontaneous combustion
djOZ TIL there was a massive ancient civilization in Illinois. In 1250 the lost city of Cahokia was larger than London. Today more than 120 massive earthen mounds are still located on the site.
MeoNb TIL all members of the Canis genus (wolves, jackals, coyotes, dholes and lycaons) are genetically compatible, meaning they can have healthy, fertile puppies as if they all belonged to the same species
0deJL TIL in 2013 a surgeon in the UK was struck off and convicted of assault after branding his initials into two patients livers. It was only discovered when 1.6-inch (4cm) initials were discovered by another doctor on an organ that he had transplanted failed.