* Professor, Department of Integrative Biology University of California Berkeley
* Associate Professor, Orthopedic Surgery Baylor College of Medicine Houston, Texas Baruch Brody Professor, Biomedical Ethics Director, Center for Medical Ethics and Health Policy Baylor College of Medicine Houston, Texas
* Professor, Microbiology State University of New York, Stony Brook
This week, scientists revealed what could be the oldest human ancestor yet found—and it looks remarkably modern. In this hour, it's a science news round-up, including the fossil that is confounding anthropologists. Plus, building a virus from scratch, and a report that pretend knee surgery sometimes works just as well as the real thing.