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TIL a part of the human population can voluntarily control the tensor tympani, a muscle within the ear. Contracting this muscle produces vibration and sound. The sound is usually described as a rumbling sound

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NnGM TIL that the fat part of a worm is called a clitellum. “The clitellum produces a ring-like band after a worm mates. The ring moves forward, collecting eggs, and slips over the worm’s head. As it slides off, the ends seal and form a cocoon. Baby worms hatch from this cocoon.”
PY6nG TIL that due to the scarcity of food in their natural habitat, newborn wild Axolotls will resort to cannibalism and eat their siblings' limbs. The victims still have chances to survive though, since the Axolotl can regenerate not only limbs but major organs such as gills at any stage in its life.
O4A4 TIL of the London Monster who pricked his victims in the buttocks. When people realised that the Monster attacked mainly beautiful women, some women began to claim that they had been attacked to gain attention and sympathy. Some even faked wounds.
OoW76 TIL about the Expulsion of the Acadians, the forced removal by the British of the Acadian people who refused to sign an unconditional oath of allegiance to Britain during the French and Indian War. Many settled in Louisiana. The French word "Acadien" evolved and was anglicized as the word "Cajun".
xVg47 TIL Bhutan, Wales, and Malta are the only countries the world whose flags have dragons on them.