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TIL that not swinging your arms when you walk increases the effort of walking by 12%, the equivalent of walking 20% faster or carrying a 10 kg backpack.

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EgyxP TIL of Jean-Claude Touche, an up-and-coming French composer in the 1940's. He was fatally wounded at the age of 18 on August 25, 1944, the final day of the Liberation of Paris, while trying to move a wounded person to safety.
wLxVY TIL that Kirsty MacColl, successful British singer / songwriter and daughter of the composer of "Dirty Old Town", died when she was diving in Mexico, pushing her 15 year old son out of the way of a speeding powerboat that ran her over.
E1ymx TIL for decades, the only "premature wards" in the US were carnival attractions at Coney Island and World's Fairs. From the 1890s-1930s, the "Incubator Exhibits" saved thousands of babies' lives, at no charge to the parents. All costs were paid by entrance fees.
m1l9E TIL that the remains of Henry Rathbone and Clara Harris, witnesses to Lincoln's assassination, were disinterred and disposed of after cemetery management determined that their graves were long abandoned.
9d0G TIL that an IAU regulation states that all mountains on Titan must be named after mountains from The Lord of the Rings.