Nothing is more fascinating to us than, well, us. Where did we come from? What makes us human? An explosion of recent discoveries sheds light on these questions, and NOVA's comprehensive, three-part special, "Becoming Human," examines what the latest scientific research reveals about our hominid relatives—putting together the pieces of our human past and transforming our understanding of our earliest ancestors.Featuring interviews with world-renowned scientists, each hour unfolds with a CSI-like forensic investigation into the life and death of a specific hominid ancestor. The programs were shot "in the trenches" where discoveries were unearthed throughout Africa and Europe. Dry bones spring back to life with stunning computer-generated animation and prosthetics. Fossils not only give us clues to what early hominids looked like, but, with the aid of ingenious new lab techniques, how they lived and how we became the creative, thinking humans of today.Where did we come from? What makes us human? An explosion of recent discoveries sheds light on these questions, and NOVA's comprehensive, three-part special, "Becoming Human," examines what the latest scientific research reveals about our hominid relatives.Part 1, "First Steps," examines the factors that caused us to split from the other great apes. The program explores the fossil of "Selam," also known as "Lucy's Child." Paleoanthropologist Zeray Alemseged spent five years carefully excavating the sandstone-embedded fossil. NOVA's cameras are there to capture the unveiling of the face, spine, and shoulder blades of this 3.3 million-year-old fossil child. And NOVA takes viewers "inside the skull" to show how our ancestors' brains had begun to change from those of the apes.Why did leaps in human evolution take place? "First Steps" explores a provocative "big idea" that sharp swings of climate were a key factor.The other programs in the "Becoming Human" series are Part 2: "Birth of Humanity," which profiles the earliest species of humans, and Part 3: "Last Human Standing," which examines why, of various human species that once shared the planet, only our kind remains.