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TIL in the 1800s there were numerous incorrect reports of a planet named ‘Vulcan’ until the planet was finally disproved in 1915 by Einstein’s Theory of General Relativity

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XE7br TIL a software developer once tested asking for donations vs. limiting trial version features. He randomly gave people either a version that asks for a donation, or one that is feature-limited. The feature-limited version made five times as much money, and the experiment cost him $17,000 in sales.
15Q8 TIL that you can tickle penguins and they laugh.
6eLw TIL Hitler’s toilet is in a New Jersey auto shop.
OlkL TIL People on Parliament computers tried to view porn 250,000 times last year.
OG8De TIL in 1981 American Airlines offered a "lifetime unlimited AAirpass" for a lifetime of free first class flights for $250k. You could get an additional lifetime pass for a companion for an extra $150k. Two of their most frequent fliers cost the airline $1m a year and flew over 30m miles.