***We're re-airing our Dec. 26 show due to technical difficulties.*** Biologist Marlene Zuk tells us what insects can teach us about our own humanity. Plus, new full body scanners are going into use at airports around the country, but how much is really known about potential adverse health effects from these x-rays? Pro Publica's Michael Grabell tells us about their investigation. Reporter Sanden Totten remembers a pre-GPS artifact every Angeleno would have had in their car: the Thomas Guide. And novelist and writer for HBO's "The Wire," George Pelecanos, talks about his new novel and life in the "hidden DC."