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TIL The little button on top of a baseball cap is called a Squatchee.

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wdlY TIL that one day in 1880, three men from Arkansas, searching for a wildcat, stumbled on a mysterious cave whose inside was covered in a radiant blue color. The three men immediately fell ill and were covered in sores after leaving the cave. They had discovered the first radium mine in America.
RYM4 Beverly Hills sits atop an oil field with nearly 100 active wells, many disguised as buildings, producing ~1 million barrels/year
VM00p TIL of the "Tetris Effect" which occurs when people devote so much time and attention to an activity that it begins to pattern their thoughts, mental images, and dreams.
a8pZy TIL Highway hypnosis, also known as white line fever, is an altered mental state in which a person can drive a car, truck, or other automobile great distances, responding to external events in the expected, safe, and correct manner with no recollection of having consciously done so.
9GgX TIL that planets “emit sounds” by pulsing with radio waves, which can be picked up by radio antennae. The Earth’s noise is sometimes referred to as Earth’s “chorus” because it sounds a bit like birds chirping.