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TIL Moons can have moons and they're called "moonmoons"

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k5ad TIL that there is a system for threatened airline pilots to remove control and navigation capability from everyone on the plane, including themselves, using an Autopilot that cannot be over-ridden from within the plane. “I’m sorry Dave, I’m afraid I can’t do that.”
ePBJ TIL of a Canadian comedy segment called “Talking to Americans”. The host easily convinced ivy league students and American politicians that Russia invaded Saskatchewan, Canadians use the 26 hour clock, and that Canada is in complete darkness during July and August.
d8YdZ TIL In the 1780s an Indian king named Tipu Sultan was the first person ever to effectively use Iron cased rockets against the British East India Company. Later in 1800s British adopted this technology and fought with it in Napoleonic wars
16VpV TIL citizens in North Queensland, Australia hold an annual "Toad Day Out" every March 29 where thousands of cane toads are captured and humanely destroyed inspired by the "Whacking Day" episode of The Simpsons.
0blL TIL antimatter is the most expensive substance on Earth at $62.5 trillion per gram