Earth & Sky is a daily short-format science series for both commercial and public radio. Produced by EarthTalk, Inc. of Austin, TX, the series is hosted by Deborah Byrd and Joel Block and consists of 90-second programs on a wide variety of topics mostly drawn from environmental sciences, earth sciences and astronomy. With support from the National Science Foundation, Multimedia Research presents the first study of a two-part summative evaluation on the impact of Earth & Sky on public radio listeners, focusing on traditional formats as well as the new “Edge of Discovery” programming that