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TIL Robert Recorde invented the symbol ’=’ in 1557 to avoid having to write “is equal to” over and over again.

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0w6o1 TIL that Pizza Hut once delivered a pizza to the summit of Mount Kilimanjaro, Tanzania.
XEdKr TIL United Airlines flight 232—which crashed in Iowa in 1989—was operating on "Children's Day," a promotion that allowed kids to fly for only 1-cent. Because of this, there were 52 children and 8 infants on board—many traveling by themselves. 11 children, including one 'lap' child, were killed.
LQMBV TIL The Sun can be observed with a hydrogen-alpha telescope that filters out all but one wavelength of red light. Lots of processing is necessary to see details and an image stacking program removes noise caused by Earth’s turbulent atmosphere. Astronomers call this "seeing"
VMKkm TIL on March 27, 1977, Robina van Lanschot decided to not reboard her flight, staying at her layover destination, despite this being against the rules. She was the sole surviving passenger of KLM Flight 4805, which crashed into Pan Am Flight 1736 on takeoff, killing 583.
Z8QL4 TIL that John Fiedler, the original voice of Piglet, died one day after Paul Winchell, the original voice of Tigger, in 2005.