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TIL that the first "phone book" contained no phone numbers and wasn't a book. It was a sheet with the names of 50 people and businesses in New Haven, CT that owned a telephone

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KOvbR Today I learned there is 8D music, that makes you think you're at a live concert when you listen to it with any headphones. Here's an epic example from the legend Hans Zimmer.
x6v1b TIL you shouldn’t rinse your mouth after brushing your teeth. This washes away all the fluoride, instead, just spit out the toothpaste then go about your day
9PXD TIL that 90-95% of the phones sold in Japan are waterproof.
vo5L TIL leeches really do have medicinal properties like they believed in ancient times, and are kept in hospitals to aid recovery from advanced micro­surgery, including the reattach­ment of appen­dages, skin grafts and plastic surgery.
VMAap TIL the Himba tribe in Namibia has no word for the color blue. In research, when shown 11 green squares and 1 blue, they couldn't pick out which was different. The research suggests that without a way of identifying the color as different, it's harder for our eyes to notice it.