Scientist Discovers What No One Was Supposed to See

Science has done an incredible job of answering some of our greatest (and strangest) questions. But there are some things that just defy any kind of rational or logical explanation -- like Clifford the Big Red Dog. Or, you know, things that actually exist in the real world, I guess. From an ancient Chinese Earthquake detector to a giant snake-shaped mound, here are 20 Mysterious Discoveries Scientists Can't Explain!

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