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TIL that an estimated 40 million Chinese people live in caves

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Mpg0 TIL that only law abiding citizens must register firearms with the U.S. DOJ Bureau of Alcohol, Tobacco, Firearms, and Explosives (BATFE). Criminals, or “prohibited persons,” are not required by law to register because it would violate their Fifth Amendment right against self-incrimination.
4KDN TIL that trilobites, the ancient ancestors of lobsters, had eyes made of calcite crystals.
P1ZnE TIL strength training also involves the nervous system, where your strength is not only determined by how big your muscles are, but by how well the nervous system can recruit muscles, synchronize their firing, and prevent mechanisms designed to prevent your body from tearing itself apart.
7r6Kb TIL of the Seven Sutherland Sisters, who had a combined length of 37 ft of hair and traveled the world as a curiosity and to promote their hair growth products. They grew up in poverty, made millions, lived an extravagant and squandering lifestyle, and the last of them died destitute.
x6an0 TIL The S-shaped bars on the sides of hearses are called "landau bars" and are a nod to the elongated hinges used to fold the convertible roofs of 18th-century carriages