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TIL Octopuses have copper-based blood instead of iron-based blood, which is why their blood is blue rather than red

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E1poW TIL that a woman named Chiara Vigo is the only person in the world who knows how to make sea silk.
VMdxp TIL an ice cube sized block of Aerogel contains as much surface area as half a football field.
YpgnA TIL that a “grotesque face jug” created as a high school art project in the 1970s was mistakenly appraised by an Antiques Roadshow expert as being worth $50,000.
w1MP TIL that in 2011, Adobe, Apple, Google, Intel, Intuit, Pixar, and Lucasfilm were found guilty of colluding with each other to repress employee wages.
6EX1w TIL emperor Hirohito offered to order all the Japanese to convert to Christianity to end the imperial religion, but general MacArthur refused, saying it would be wrong to force a whole nation to convert.