Intelligent Life?

SETI, the Search for Extra Terrestrial Intelligence is now 50 years old... During that time it has been increasingly hard to find signs of intelligence here.

Audio: CBS Radio's Osgood File 4/16/10, CBS Sunday Morning Feature 4/18/10.

SETI's 50 year search for alien life has concentrated on using powerful telescopes and antennae to find radio signals with patterns that might be signs of intelligent life. Dick Carrigan, of the Fermi National Accelerator Laboratory suggests scientists look for something else people on Earth can relate to: pollution.

Audio: BBC, PRI & WBUR's Here & Now 4/20/10, Host: Robin Young.