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TIL there exists a Linguistic Diversity Index: the probability [0-1] that 2 people selected from at random will have different mother tongues. Papua New Guinea comes first with a score of 0.988 as it has over 820 indigenous languages. Some other scores ~ India: 0.914, USA: 0.333, UK: 0.154

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nenmB TIL In 1999, NASA lost a $125 million Mars orbiter because half the project staff used imperial measurements and the other half used metric.
5gW8 TIL that in 2006, doctors removed two fetuses from inside a 2-month-old girl that had the rare condition known as Fetus in Fetu.
R70P6 TIL during the victorian era there was a penomenon of multiple girls claiming to survive without food or any nourishment, and often claimed to have some kind of supernatural powers. Many regarded their supposed abilities as miraculous.
WkkZ8 TIL 'Nineteen Eighty-Four' nearly wasn't called 'Nineteen Eighty-Four'. In the year leading up to its publication, Orwell vocalised his indecision over what to call his novel before settling on 'Nineteen Eighty-Four'. Orwell took a long look at the title 'The Last Man in Europe'.
kJxVW TIL there is a circular island in Argentina, called El Ojo, almost 400 feet in diameter, floating in a slightly larger circular lake.