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TIL after the Suez Canal was completed, species from the Red Sea used it to migrate to the Mediterranean and became invasive. This phenomenon is called the Lessepsian migration, after the builder of the Canal, Ferdinand de Lesseps

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M7xxK TIL that the sewage pipes on the USS Gerald Ford, the US Navy's newest carrier, are too narrow to handle the load of the full crew, causing vacuum failure and repeatedly clogged toilets. A specialized acid solution must be used to flush and unclog the system, at $400,00 per flush.
mxv9M TIL that even though Jupiter's moon Io ("EYE-oh") has no water, it still has waves. The force from the gravity of Jupiter and its other massive moons pulls Io's surface up and down on all sides causing waves of rock up to 100 meters (328 ft.) high.
1on8 TIL after the entire national Soviet hockey team was killed in a plane crash in 1950. Stalin’s son Vasily, who managed the team, covered up the disaster and replaced all the players to avoid his Fathers wrath. Stalin never noticed.
6EJVW TIL of The Box, a music video TV Network that existed from 1985-2001. It was similar to MTV but the music videos that aired were selected by viewer request via telephone. Many videos would show up on The Box and would be quite popular before they ever appeared on MTV.
VMyWQ TIL the creator of the Rainforest Cafe chain first tested out the concept in his house. He decorated it with 45 birds, 9 fish tanks, and many plants. He even set up fake thunderstorms. His neighbors thought he was crazy.