Earlier this year, a fossil-hunting team led by Cleveland Museum of Natural History paleontologist Yohannes Haile-Selassie found a rare prize - an intact grouping of bones from a single human ancestor nearly 4 million years old. Haile-Selassie and co-expedition leader Bruce Latimer, the museum's director, say this once-in-a-lifetime discovery will help scientists learn more about when - and why - our ancestors began to walk upright. At the same time, this new find, along with other recent discoveries by Haile-Selassie, is catapulting Cleveland back into the international spotlight for human origins research. Move over Lucy! As you listen to the program, follow along on the web with exclusive photographs from the site in Ethiopia where these discoveries were made.