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TIL severed fingertips can sometimes regenerate, but mostly this only occurs for kids and only if some fingernail remains.

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6EwpZ TIL Research from Michigan State University is one of the first to identify common attributes of cybercrime networks, revealing how these groups function and work together to cause an estimated $445-600 billion of harm globally per year.
ZE6v TIL the saying “cut of one’s jib” is because in the 17th century, the shape of the jib sail often identified a vessel’s nationality, and hence whether it was hostile or friendly.
gMZwy TIL that Mattel, in an attempt to make their Ken doll more appealing to girls, made Earring Magic Ken. The doll was bought in record numbers but was discontinued weeks later because of its popularity with gay men.
MXvV TIL that the Chinese philosopher Zhuangzi first proposed the “Matrix philosophy” after dreaming he was a Butterfly. “Now I do not know whether I was then a man dreaming I was a butterfly, or whether I am now a butterfly, dreaming I am a man”
W7eW8 TIL screwworm, a nasty parasite that can kill hosts used to be common in southern USA and Mexico. Program in place for several decades have virtually eliminated all screwworm all the way to Panama/Colombia border