The Best Episodes Written By Graham Townsley

In gripping forensic detail, the second program in “Becoming Human” investigates the first skeleton that really looks like us — “Turkana Boy” — an astonishingly complete specimen of Homo erectus found by the famous Leakey team in Kenya.

The first hour examines the factors that caused the split from the apes. The film explores the fossil of “Selam,” also known as “Lucy’s Child” — an amazing, nearly complete child fossil that helps shed light on our ancestors’ early development and how we began to depart from that of chimps.

The final program examines the roots of our own species, Homo sapiens, which new evidence pinpoints to southern Africa some 200,000 years ago. New discoveries are upending old ideas and suggesting that our exodus from Africa was far earlier than previously thought.