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Til that fingernails serve to enhance sensation and precise movements of the fingertips through the counter-pressure exerted on the pulp of the fingers by the nails.

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160k8 TIL of Kurt Gerstein, a Nazi officer who tried to alert the world of the Holocaust while it was happening by sending detailed reports to Swedish, Swiss, Dutch and Catholic officials. These were largely ineffective and he died by suicide in 1945
OGMAa TIL: Because Nintendo could not get the rights to the Popeye cartoon character, they came up with Mario instead.
VM7gZ TIL A Marking Harness, a sponge of chalk or crayon worn on a Ram's chest, is used to tell which sheep a ram has mounted. (Some sheep end up looking polka dotted.)
QJoeE TIL Hippocrates believed that the natural processes of the body shouldn't be intervened. This philosophy carried into the late 1800s to the extent that development of pus was seen as positive indicator of healing because it was routinely found in all kinds of wounds. It was called "laudable pus".
b5np TIL that there is a business labyrinth in a limestone deposit in Kansas City.