At the end of the Ice Age, over 100 species of giant animals vanished—including millions of mammoths. Some scientists blame small bands of nomadic hunters. But think about it: 5–10 million humans worldwide 12 million mammoths Many found flash-frozen in Siberian permafrost Could a few hunters really exterminate every mammoth on Earth? Or was something far more catastrophic at play? | The Randall Carlson