It’s an interesting hypothesis, but we’ve found no evidence to support it. If they were highly advanced and sophisticated, even more so than the ones we currently know about, then they should have left something behind that we would find. Stone tools that were used about 3 million years ago by some of the first humans have been found in Kenya. So, if a civilization was more advanced than just basic stone tools and existed within the past couple million years they should’ve produced some evidence of their existance for us to find.
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