Rise of Humans: Great Scientific Debates

One of the most famous scientific debates in anthropology took place in the 1970s, with the discovery of fossil remains of a possible Homo ancestor, Australopithecus afarensis. Where exactly did Homo come from? Follow this highly public story from the perspective of the key personalities involved: scientists Don Johanson and Richard Leakey.

In 1994, paleontologists discovered the 4.4-million-year-old remains of Ardipithecus ramidus. Is it a true hominin? What skeletal features suggest the tradeoffs between being an effective climber and walking bipedally? Answer these and other questions by closely examining the fossil and genetic evidence of this fascinating "ground ape."

Your brain separates you more from apes than any other anatomical feature. Investigate the gradual increase in hominid brain size in the fossil record. Looking at what fossil skulls (such as the Taung skull) reveal about blood circulation and cooling, you'll shed new light on brain size and skull structure.

Explore the relationship between diet and morphology in this lecture on Australopithecus robustus and Australopithecus africanus. The teeth and jaws of these two species, you'll discover, offer intriguing windows into the fierce debate surrounding the dietary hypothesis and the true adaptive differences between robust and gracile hominids.

Was Africa or Asia more central to human origins? How can we tell? Drawing on the ideas and theories of prominent scientists, including Charles Darwin, Ernst Haeckel, and Louis Leakey, learn how we found the truth about where our genus Homo came from—and where it evolved.

Tool use marks a tremendously important step in evolution. But how important is it really, considering chimpanzees can also make and use tools? Professor Martin offers you a detailed picture of what early stone toolmakers were like, as well as some of the primitive tools found in parts of Africa.

Examine what the fossil record reveals about Homo habilis, a species that serves as a transitional marker between Australopithecines and the rest of the genus Homo. A key mystery in this lecture: how Homo habilis can have the anatomy to be our ancestor yet not exist at the right time in evolutionary history.

Using a magnificent find of the skeleton of a 1.5-million-year-old boy (known as the Nariokotome skeleton), delve into the issue of how important size was to becoming human. Recent discoveries of Homo erectus remains, as you'll discover, have led to a reevaluation of the growth process of these hunters and gatherers.

Professor Hawks explains the complexities of the Movius Line, a fairly clear line that separates the Western distribution of hand axes from areas in the East where they were rarely made. Central to this constant puzzler in the story of evolution are the more than 500,000-year-old remains of the Peking Man.