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TIL that the first aerial refueling occurred when Wesley May climbed from a Lincoln Standard to a Curtiss Jenny with a 5 gallon can strapped to his back in 1921.

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Mebom TIL Apple’s smartphone wasn’t the first iPhone, the first was made by Cisco 22 days earlier. The Cisco “iPhone” was a VoIP device that allowed its customers to use Skype without a computer. The companies later settled the trademark lawsuit, with both keeping rights to the iPhone name.
GLyJ TIL of a region near a black hole called a photon sphere where the gravitational pull is so strong that light photons orbit it, meaning if you were at that point and turned to the side, you could see the back of your own head.
b9w0N TIL: Americans never 'lost' their British accents. It was the Brits that adopted 'posh' in the early 1800s. American port cities emulated it for a while.
kO0JE TIL In 1975 the Nobel Prize for Medicine was awarded to USA's Howard Temin for his research on cancer. During his acceptance speech in Sweden, he called out some present -- including a Queen and other royalty -- for smoking. He insisted that the ashtray on the laureates' table be removed.
rRj80 TIL that American Troops were sent to fight in the Russian Revolution or 1918.