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TIL about Demodex, or eyelash mites. They are too small to see with the naked eye, and feed off of the dead skin cells of humans. Almost every adult human alive has an eyelash mite population living on their face.

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via reddit.com

Q1Mp TIL that in 1993, A company called “Space advertising inc.” attempted to launch a giant billboard into low earth orbit. From earth the billboard would look almost as big as a full moon. After the project was canceled, a bill was introduced that banned any further space advertising.
p8ye TIL Astronauts experience a euphoric ‘cognitive shift’ akin to Buddhist Monks after seeing Earth from space.
Z8kNG Til that killer whales are such apex predators they hunt and kill terrestrial mammals such as moose and deer, When swimming between islands in North America
7rEPZ TIL that front singer of a-Ha had a long relationship with the woman from the "Take On Me" music video that started while producing the music video.
1KRW TIL for the movie Labyrinth (1986), Jim Henson wanted Sting to play Jareth, the Goblin King. However, he changed his mind after his kids convinced him that David Bowie would have “lasting appeal”.