In 1974, a scientist dodging tedious paperwork took a spur-of-the-moment walk across the Ethiopian desert. He caught a tiny glint of white in the dirt, a rock most people would have kicked aside. That single glance turned out to be our 3.2-million-year-old great-grandmother, Lucy.

This episode digs into the human, story-driven life of paleoanthropologist Donald Johanson, the man who found Lucy. It moves beyond the dry timeline to show how a trained eye, obsessive patience, and a gift for communication bridged the gap between ancient bones and the public, fundamentally reshaping our understanding of where we come from.

• Why recovering 40% of a single skeleton was almost unheard of in the field
• How Lucy's bones proved bipedalism while her curved fingers revealed tree-climbing
• How her flared rib cage encoded a plant-b ...