In the previous three years, 144 90-second Earth & Sky radio shows have been produced under sponsorship of the National Aeronautics and Space Administration. The impact of these shows was explored with a posttest-only experimental design comparing a treatment group that listened to nine daily NASA shows focused on the topic of Antarctica and a control group that listened to nine daily non-NASA shows about whales. Participants were randomly assigned to groups, which did not differ on the variables of gender, age, ethnicity, education, frequency of hearing Earth & Sky, and interest in hearing