Are We Alone - Alien Invasion: Margaret Race and Margaret McLean

Part 6 of Alien Invasion, featuring Margaret Race, biologist and Principal Investigator at the SETI Institute, and Margaret McLean, director of bioethics at the Markkula Center for Ethics, Santa Clara University.

Pave New Worlds - Keith Cowing

Part 1 of Pave New Worlds featuring Keith Cowing, biologist and editor of NASAwatch.com.