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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 .