Ancient Teeth Reveal Early Human Evolution Complexity Fossilized teeth unearthed in northeastern Ethiopia over a lengthy archaeological investigation suggest that two different types of early human ancestors lived side by side between 2.6 and 2.8 million years ago—one possibly being a yet-undiscovered species. This finding offers a new perspective on the complex paths of human evolution. Ten of the found teeth, collected between 2018 and 2020, are associated with the ancient genus