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TIL that one of the Seven Great Houses in Ancient Iran was the House of Karen who once tried to claim independence and refused to pay their tribute, but were ultimately defeated for this.

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188X TIL that a Mongol ruler had “Who ever opens my tomb, shall unleash an invader more terrible than I” inscribed on his casket. On the day a Soviet anthropologist exhumed his body the largest military invasion in history was launched against the USSR.
ZpMkQ TIL of Percy Ross, best known for his column, 'Thanks a Million' which ran in over 800 publications. He gave away his fortune, an estimated $20 to $30 million over a period of 17 years. Newspapers called him, “America’s Rich Uncle.” He died in 2001 at age 84, relatively unknown, just as he wished.
kJ475 TIL the term "semi" as in semi-trailer bears the name from the trailers ability to support itself. A trailer can fully support itself whereas a semi-trailer has no front axle, requiring support from the tractor portion to remain stable.
b6WeQ TIL that sharks' skin is basically covered entirely with teeth. They are coated with 'denticles', which are much closer to teeth than to fish scales.
5YweD TIL The town of Buford only has one resident: 60 year-old Don Sammons. He has been all alone in the southern Wyoming town on Interstate 80 since his son moved out over three years ago.