In this episode, NOVA encounters "Selam," the amazingly complete remains of a 3-million-year-old child packed with clues to why we split from the apes, came down from the trees, and started walking upright.

Encoded with permission for digital streaming by Infobase on December 08, 2013. Learn360 is distributed by Infobase for Films for the Humanities & Sciences, Cambridge Educational, Meridian Education, and Shopware.

Introduction: Adapt or Die (1:53) -- Sponsors: NOVA (0:51) -- Bipedal Apes (2:01) -- Searching for Fossils (2:47) -- Selam's Journey (1:33) -- Australopithecus Afarensis (3:06) -- Bipedal Creatures (2:15) -- African Rainforest (1:46) -- Changing Climate (2:37) -- Saving Energy (2:23) -- Examining DNA (1:45) -- West Africa Fossils (2:13) -- Tumai (2:44) -- Biped Evolving (2:07) -- Seeds of Humanity (2:39) -- Brain Development (3:02) -- Dawn of a New Era (3:02) -- Homo Habilis (1:58) -- Environmental Change (2:18) -- Swings of Climate (2:32) -- Ocean Sediments (2:18) -- Creatures of Climate Change (3:03) -- Credits: First Steps: Becoming Human- Unearthing Our Earliest Ancestors (1:42).