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mating cycle of animals in a lunar calendar. The markings found in over 400 caves across Europe were compared to the mating cycles of the animals with which they were associated, showing a correlation with the month of the year in which the animals depicted in the cave paintings would typically give birth. The markings were 20,000 years old, predating attested proto-writing systems by 10,000 years. In 2026, researchers at Saarland University published a study

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