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TIL the ankle–brachial index is the ratio of the blood pressure at the ankle to the blood pressure in the upper arm. Measurements are taken when the person is lying down, face upwards on a table without the head or extremities dangling over the edges. It's used to check for peripheral artery disease

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Yp5vd TIL of Princess Alice, Countess of Athlone, the longest-lived British princess by descent, and the last surviving grandchild of Queen Victoria. She lived through six reigns- those of Victoria, Edward VII, George V, Edward VIII, George VI and Elizabeth II. She died in 1981, aged 97.
xQG0 TIL that Star Wars is mostly unknown in China. Few saw Episodes 4-6 in theaters; Episodes 1-3 are better known. Disney had to educate fans about the franchise when promoting The Force Awakens. “Marvel characters are the American action heroes to a whole generation of millions of Chinese”, instead.
WkKGN Today I learned about the Driftless Area; a rugged area of Wisconsin, Iowa, Minnesota, and a minor part of Illinois that was completely missed by glaciers. It is roughly the size of West Virginia, and is home to huge bluffs, deep canyons, and rare species of plants found no where else.
ZjaY TIL of John Clem, a drummer boy in the Union Army during the Civil War, who at age 11, shot a Confederate colonel who had demanded his surrender. Promoted to sergeant, he became the youngest NCO in Army history. He retired in 1915 as a general and the last actively-serving veteran of the Civil War.
neJZW TIL that a Danish man saved over 6000 chinese people from the japanese army during the Nanking Massacre.