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TIL: Buttonholes for clothing were invented 3000-4000 years AFTER the invention of buttons. Before this, buttons were mostly decorative and useless. Their design hasn't changed much and is one of the most enduring designs in history.

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pYaOQ TIL about "Green Rust", a highly reactive iron mineral that scientists believe could have been a precursor to life on Earth by acting as a catalyst for converting simple organic molecules into more complex structures
DQgrD TIL Deep-sea divers use a mix of 79% helium and 21% oxygen, making their voices squeeky. They need to use pitch control to understandably communicate.
VMGV0 TIL that Austrian artist Oskar Kokoschka was so obsessed with his former lover Alma Mahler, widow of composer Gustav, that in 1918 he commissioned a life-sized fetish doll that he wished to 'embrace'. He was dissatisfied with the doll but did several paintings of it. Eventually, he beheaded it.
XREP TIL that during Pablo Escobar’s “career” it is estimated that 80% of the cocaine entering the U.S. was supplied by him and Escobar was considered one of the richest men in the world during that time.
m1Rep TIL that the tiny island country of Singapore holds a collective estimated reserve of about US$1.87 trillion dollars, and the actual reserve is substantially larger than that.