The Stone Age began more than two million years ago, and ended around 3300 BC, as humans began to discover metalwork with the dawn of the Bronze Age. Compared to modern humans, Stone Age humans and human ancestors may have been primitive—but they were far more sophisticated than the grunting cavemen often depicted on screen. In fact, early humans were ingenious problem-solvers who managed to survive and thrive in hostile environments. More and more, researchers are finding we’re not so different.