mark. These mysterious ancestors were called “ghost populations.” We’ve found their genes in our genes, Bruno said, but we don’t yet know who these people were. We have not found traces of them in dig sites, neither their own bones nor the bones of what they ate. What this means, Bruno said, is that we haven’t found their trash, and we will not name them and define them, they will stay “ghost,” until we do stumble upon their trash. But their trash might never be found. Don’t underestimate the power of time to erase, he said. Much of life, and what matters most to a culture, consists of what a
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