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TIL That this day 125 years ago physicist Wilhelm Conrad Röntgen becomes the first person to observe X-rays a significant scientific advancement that would ultimately benefit a variety of fields most of all medicine by making the invisible visible.

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Y7elG TIL in Japan they used to keep time so that there was always 6 hours of night and 6 hours of day, so an “hour” changed length in winter and summer
ne1ZW TIL (According to Brent Berlin and Paul Kay's 1969 study Basic Color Terms: Their Universality and Evolution) Names for brown, purple, pink, orange, and gray will not emerge in a language until the language has made a distinction between green and blue.
4ZJg TIL a man was swallowed whole by a sperm whale, but found 18 hours later and survived.
nvxG TIL hemp was banned in the 1930’s (U.S.) due to it being competitive with, at the time, newly founded synthetics fibre and plastic industries.
Ypw0W TIL all Domestic cats are same species (Felis catus) and similarly all dogs/domestic dogs are same species (Canis familiaris)