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TIL - Seven presidents of USA were born in a log cabin

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JjN1 TIL The Economist named Hank Hill as one of the wisest people on television.
OoJ1 TIL a Polar bear attacked a US Submarine when it broke through sea ice in 2003
69d8Z TIL During the American Civil War, the Confederacy attempted to develop an unusual weapon known as the "H.L. Hunley," which became the first combat submarine to sink an enemy warship. On February 17, 1864, Hunley achieved this remarkable feat by torpedoing and sinking the Union Navy's Housatonic
6E8xW TIL Count Juan Raphael Dante, a director of the US Karate Association until 1962, didn't like the focus on ceremony, tradition, and protocol, over "effectiveness", so he created the "Dance of Death" system, taught in a mail-order booklet, World's Deadliest Fighting Secrets, advertised in comic books
7rvjO TIL that not everyone can unfocus their eyes whenever they want to. It's accomplished by having the ability to relax the ciliary muscles in your eyes, which causes them to lose their focusing powers.