Ethiopia, 1974 – Yves Coppens discovers the fragments of the oldest human being, Lucy. Chad, 2001 – another French anthropologist, Michel Brunet, claims to have found the skull of an even much older hominid, Toumaï. A unique interview with the two of them and private footage will retell how these apparently harmless divergent theories started a rivalry, which was amplified by their teams, their peers and the media. Yet one of them has always been supporting the other’s theory…