Together with paleoanthropologist Sang-Hee Lee, we take a journey millions of years into the past to unearth the mysterious origins of Homo sapiens. Do we owe a debt of gratitude to Neanderthals for our capacity for speech? Why did we stand up, and at what cost? What does the future hold as our bodies continue to evolve? In her latest book, "Close Encounters with Humankind" professor Lee answers these questions and countless more, revealing much about what it means to be human.