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TIL only larger ships in the US Navy have a Captain, smaller frigates etc. have Commanders

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E1W9d TIL "Saudade" is the word for being nostalgic about past relationships that are hard to let go. It's the recollection of feelings/experiences/relationships/etc that brought happiness, but also the pain of separation from them. It acknowledges that longing for the past would detract from the future.
kkR5 TIL that after being rejected by 20 publishers, Frank Herbert’s 1965 sci-fi classic Dune was finally picked up by Chilton Books. The publisher was previously known only for those big car repair manuals sold in auto parts stores.
y4OX TIL A single gram of DNA can store almost a zettabyte (one trillion gigabytes) of digital data. And Microsoft is making an investment in DNA data storage.
LNnP TIL that what I have always known as “the wave” (as in a crowd) is called a “Mexican Wave” just about everywhere outside of America.
kODGd TIL of the book The Man Who Mistook His Wife for a Hat by Oliver Sacks. It's about curious medical cases, including one of a patient with visual agnosia who not only did really mistake his wife for his hat, but also couldn't tell the difference between his shoe and his foot.