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TIL most audio recordings contain a background "mains hum" from electric power grid oscillations that can be matched with grid readings to date the clip to the second it was recorded.

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LkjmP TIL In 1867, Russia sold the territory of Alaska to the U.S. for $7.2 million. A mere 50 years later, the Americans had earned that amount back 100 times over!
9YOEr TIL of Mother Featherlegs, a prostitute from Wyoming named so for her frilly lace underwear. She was murdered by her partner "Dangerous Dick" Davis in 1879. There is a monument to her near Lusk, WY - called the the only monument in the United States to a prostitute.
vgGK TIL that Red Hot Chili Peppers frontman Anthony Kiedis lost his virginity at the age of 12, to his father’s 18-year old girlfriend, with his father’s blessing
LA4p TIL that Coca Cola sales in Sweden often drop more than 50% during Christmas, due to the tradition of drinking Julmust.
J1Op1 TIL, Jose Melena was at work loading pallets of canned tuna into a 35-foot-long pressure cooker when a coworker filled it up with 12,000 pounds of tuna and turned it on for 2 hours while Jose was still inside.