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TIL that gravitational waves have a frequency conveniently within the range of human hearing. This is the sound of two black holes spiraling into one another, echoing through the universe for billions of years

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OGJNY TIL that there were women gladiators, known as “gladiatrices”. They fought against each other or against animals to entertain their audience.
NXA4M TIL There is a zip code, 98164, in Seattle that is only 1 city block and has only 250 people in it.
OoxK6 TIL Western Union sent it's last telegram in 2006
69BGY TIL That a small cache of Roman coins were found in a ruined castle on Okinawa, Japan during an archaeological excavation in 2016, marking the first time Roman coins were found on the Japanese Islands. The coins depicted Emperor Constantine the Great, who ruled from 306 to 337 AD.
Egy9X TIL that adults have 206 bones, while babies start out with around 305. Bones fuse together as we grow, which is why we end up with fewer bones than we had at birth, with a quarter of our bones being in our feet.