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Read transcripts from online chats with the scientists behind SEARCH FOR THE FIRST HUMAN!
May 10th, 12:00 (ET)
Drs. Martin Pickford and Brigitte Senut,
College de France
Hosted by THE WASHINGTON POST
Dr. Donald Johanson
Director, Institute of Human Origins,
hosted by America Online.
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For decades paleontologists have been searching for vital clues in Africa -- the remains of creatures nearest to the event that changed the world: the split between man and ape.
In November 2000, Martin Pickford and Brigitte Senut from the College de France and a team from the Community Museums of Kenya made a remarkable discovery. In the Tugen Hills of Kenya they unearthed a group of fossils they believe sheds light on the origins of humankind. The team called their find Orrorin tugenensis. It seemed like the discovery of a lifetime. Or was it?
The bones are older than any hominid bones found before. They are a staggering six million years old.
Today, Orrorin is unleashing one of the greatest controversies the study of human origins has ever seen. But is it really a hominid?
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Fossilized bones belonging to Orrorin tugenensis
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The defining feature of the human race is the ability to walk upright. So this is what paleoanthropologists look for. They search for fossilized clues that can tell them whether the creature spent most of the time walking on two legs rather than four.
If Martin and Brigitte find these clues and Orrorin was, indeed, walking on two legs six million years ago, scientists will have to rethink their ideas about how we split from the apes. The standard theories on how, when, and why we learned to walk on two legs would have to be reexamined.
Martin and Brigitte also make a claim about one of the most famous discoveries of all time: "Lucy," a hominid from just over 3 million years ago, found in Ethiopia. Donald Johanson, who discovered her in 1974, claimed her to be our direct ancestor.
The fossils from Orrorin have led Martin and Brigitte to the revolutionary conclusion that Lucy and her type, the australopithicines, were not our direct ancestors: rather, they were a branch that became extinct.
Orrorin has created incredible debate, but what else could we expect from a candidate for our earliest ancestor, the first human?
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