› added 3 years ago

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TIL the rarest naturally occuring element on Earth, astatine, is so rare that there is only 28 grams of it on Earth at any given time. It is difficult to study, as most of its isotopes have a half-life of 1 second or less. Its appearance is not known with certainty.

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via reddit.com

n74d TIL that when you search “I want to kill myself” on google, or a related phrase, it will show the phone number for the national suicide prevention lifeline before the results.
v1ZKL TIL in an early draft of Back to the Future, the time machine was a refrigerator. It was changed because Robert Zemeckis was afraid kids would imitate the film and get trapped.
gMbL8 TIL During the making of the 1942 German movie 'The Great Love' unable to find background extras who matched the height of the lead actress Zarah Leander, SS guards were brought in and dressed up as women and used instead.
rN9kM TIL people can get leprosy from armadillos.
kKYe TIL menstrual stem cells (found in period blood) could be used to create more tissue types than other adult stem cells, including bone, blood vessel, fat, brain, lung, liver, pancreas, & heart. They grow more readily & rapidly than other types of adult stem cells from bone marrow & umbilical cords.