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TIL the meaning of Kraftwerk's song "Radioactivity" has evolved since debuting in 1976: it started as an observation of radioactivity being "in the air for you and me", then by 1992, had become an anti-nuclear protest with new lyrics. By 2012, "Fukushima" was added to the list of named disasters.

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4XKQ5 TIL of Fido, President Lincoln's dog. Shortly after Lincoln's assassination, the dog put his front paws on a drunk sitting in the street and the drunk knifed the dog to death. The president's popularity led to fido becoming the generic name for a dog.
j6N7E TIL of Bullshit Jobs - it's been estimated that over half of societal work is pointless.
oRYe7 TIL about myco-architecture--an ongoing project at NASA ARC to prototype fungi that would grow into usable habitats on Mars. Once fully grown, the fungi would be baked. The project aims to reduce weight carried on rockets when compared to the typically envisaged metal-and-glass buildings.
RJbw TIL: Sexual reproduction for barnacles is difficult, as the organisms cannot leave their shells to mate. To facilitate genetic transfer between isolated individuals, barnacles have extraordinarily long penises⁠. Barnacles probably have the largest penis to body size ratio of the animal kingdom.
GY787 TIL of Adrian Carton de Wiart, a vetern of four wars. He survived seperate instances of being shot in the face, head, stomach, ankle, leg, hip, and ear; survived two plane crashes; tunnelled out of a POW camp; and tore off his own fingers when a doctor refused to amputate them.