Listen to a live conversation between two legends of human evolutionary science

Tune in at 6:30 ET today to catch a conversation between two major figures in the field of human evolution and paleontology, Donald Johanson and Richard Leakey. They're having a conversation about the importance of new discoveries in human evolution at New York's American Museum of Natural History. »5/05/11 6:00pm5/05/11 6:00pm