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I've never quite been the same since I learned about trovants. These are rocks, actual rocks, that not only 'grow' but MULTIPLY. 
The most famous example can be found in the tiny village of Costeşti in Valcea County, Romania. Known locally as the 'living stones' they have been the backdrop to folktales for millennia.
Indeed they have been there much longer than people, coming into existence due to a series of earthquakes some 6 million years ago.
