Caught on radio
Living on Earth: Alien Life on Earth
"Strange life forms don't have to be the domain of distant planets and old Star Trek episodes. Astro-biologist Paul Davies says life as we don't know it might already exist in our own backyard. Davies talks with host Bruce Gellerman about the possibility of life on Earth evolving more than once, and about why scientists should launch a "mission to Earth" to find alien life."