Ancient Peruvian skull with metal implant baffles scientists

If an alien civilization far more advanced than anything on Earth existed thousands of years ago, would they have embedded a piece of metal inside someone’s skull? That is, at least, what this looks like.

Ancient Peruvian skull with metal implant baffles scientists

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Ancient Peruvian skull with metal implant baffles scientists

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Ancient Peruvian skull with metal implant baffles scientists

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Ancient Peruvian skull with metal implant baffles scientists

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