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TIL that cows actually only have one stomach, but it has four different compartments to it, so you will hear them being described as having four stomachs. Each compartment (rumen, reticulum, omasum, abomasum) is used for a different stage of their digestive process.

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JYovQ TIL that the name "quark" for subatomic particles was inspired by the book Finnegans Wake. Physicist Murray Gell-Mann coined the term after seeing the following passage in the book: ‘Three quarks for Muster Mark!’.
5Y0nR TIL a species of dolphin has twice as many brain neurons as a human brain.
5Y0ok TIL that there is an island (Pheasant Island) between the border of France and Spain that, every 6 months, it changes from one government to another, during the change, there is also a ceremony on the island. However access is prohibited.
D1RJr TIL Empty Fort Strategy strategy involves using reverse psychology to deceive the enemy into thinking that an empty location is full of traps and ambushes. In 195, warlord Cao Cao used it to make his opponent think there was an ambush, which bought him time to prepare a real ambush
Yp9PW TIL In the third century the Roman Empire was split into several regions with several leaders. One of those leaders Constantine had ambitions to retake the Roman Empire. He lacked an army large enough to do so. He decided if he converted to Christianity the Christians would fight for him. He won.