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TIL that the earliest Sony Walkman models had two separate headphone jacks labeled "guys" and "gals" so you could share your music with others and not come off as being antisocial.

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mR5O TIL an Australian man wearing a nylon jacket and wool shirt built up 40,000 volts of static electricity, resulting in burned carpets, melted plastic, and a massive evacuation.
1a8ar TIL that an autistic socially awkward day trader helped spark the 2010 flash crash of the Dow Jones Industrial Average, despite earning $70M over several years Navinder Singh Sarao continued living in his parents basement and his biggest purchase was a used Volkswagen for under $10,000.
plb8 TIL that the inventor of Vaseline was such a firm believer in its medicinal properties that he claimed to have eaten a spoonful of it a day; During a bout of pleurisy in his 50s, he ordered his nurse to cover him from head to toe in the substance, and soon recovered. He lived to be 94.
w1E8 TIL that mathematician John Edmund Kerrich passed his time in Nazi captivity by flipping a coin 10,000 times. The total percentage of heads and tails flips varied wildly at first but gradually converged around 50/50, providing a demonstration of the Law of Large Numbers.
LkYZd TIL that the sleepover scene in Grease where Rizzo sings "Elvis, Elvis, let me be! Keep that pelvis far from me!” was shot on the same day that Elvis Presley died.