In Episode 1, we search for human's most ancient ancestors begins with the emergence of amphibians 400 million years ago followed by mammals and primates; and then thanks to scientists in paleontology and paleobotany hunted for the earliest hominids, including Ramapithecus and Homo Erectus, in Africa, in the African Rift Valley around Lake Turkana where they found evidence of Charles Darwin's theory of evolution and natural selection among the plants, bones and stone tools of early hominids.