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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

b9Wb0 TIL A 25-year old man revived 12 dead lakes in India to fight off water scarcity.
xV4mB TIL that mules can't reproduce because they're the sterile offspring of a horse and a donkey
5nPk TIL That Albert Einstein had a daughter in 1902. No one knows what happened to her.
5YYP8 TIL NBC hired JJ Abrams and Joss Whedon to each direct an episode of 'The Office' to air during the 2007 February Sweeps Week
epgkb TIL about Japanese Kangiten inspired by the Indian Ganesha