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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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grMVX TIL The Mojave Desert Mailbox is considered the most isolated and least accessible mailbox in America. It sits halfway along the 150 mile, 4-wheel drive only, Old Mojave Rd, which can take 3 days to drive the entire length.
p8l7e TIL Marvel Super Hero Island at Universal's Islands of Adventure had a scarezone during the 2002 Halloween Horror Nights, where superheroes were killed in horrific ways and villains took over the island. Marvel officials were angry after finding out and the scarezone was never used again after 2002.
w6LE TIL 90,000 Kentuckians fought for the Union, while 35,000 fought for the Confederate States. But Kentucky has 72 Confederate monuments and only two Union ones
D1rdp TIL Mao Zedong's English interpreter Ji Chaozhu moved to New York in 1939 at age 9, to avoid the war and spent a year at Harvard before returning to China in 1950. He worshipped Mao and remember the Chairman as “serene,” “regal,” and “mentally far away, at peace.”
Br1kd TIL the ‘airline captain accent’ is actually a subconscious imitation of famous pilot Chuck Yeager passed from generation to generation.