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TIL over half of earth’s wildlife has been killed in the past 40 years

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jNDQj TIL Herman Hollerith's invention, the punched card tabulating machine, patented in 1884, marks the beginning of the era of mechanized binary code and semiautomatic data processing systems, and his concepts dominated high-tech for nearly a century. His inventions led to the creation of IBM in 1924.
7r6Zp TIL the sound produced by two blackholes colliding is referred to a chirp by scientists as it sounds like a slide whistle
P15LE TIL the largest wave ever surfed successfully without a tow (paddle-in) is 63 ft (19.2 m) by Aaron Gold at a break known as 'Jaws' off the coast of Maui, Hawaii in 2016.
b9XZ TIL that generally, income per capita increases with absolute latitude. This is called the Equatorial Paradox
W7Dd TIL certain acronyms such as KIGY (Klansman I greet you), AKIA (a Klansman I am) and AYAK (Are you a Klansman) allow Ku Klux Klan members to secretly affiliate with and identify other KKK members.