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TIL there are as many as 2,000 serial killers currently at large in the United States

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amYZ TIL that any domino can knock over another object up to 1.5x its size due to gravitational potential energy. In 29 dominoes, the last domino would be as tall as the Empire State Building, irrespective of first domino is so tiny (5 millimeters tall and only 1 millimeter thick).
xVe5b TIL that the Sphynx cat came about barely in the 1960s and originated in Canada when a domestic cat gave birth to a hairless kitten. It was then bred solely for its natural hairless trait.
9YXYM TIL: Los Angeles original name is "El Pueblo de Nuestra Señora la Reina de los Ángeles de Porciúncula" which means "The Town of Our Lady the Queen of the Angels of Porciúncula”
VBN04 TIL about the psychiatric disorder 'glass delusion! The disorder caused people to fear that they were made of glass and likely to shatter. It was recorded in Europe, mainly in the 15th to 17th centuries.
gMJn9 TIL in the early 2000's Serena and Venus Williams, along with their father Richard, were regularly accused of "match fixing" when the sisters competed against one another. One incident, where Venus pulled out entirely from a semifinal match against her sister (tendinitis), had fans demanding refunds