For more than two decades, Sahelanthropus tchadensis — a very early (6.7 to 7.2 million years old) hominin species discovered in Chad in 2001 — has hovered at the center of a contentious question: did one of humanity’s earliest relatives walk upright? New research led by New York University paleoanthropologists adds the strongest evidence yet that it did. Their findings suggest that Sahelanthropus tchadensis was an African ape-like early...
