There's an old saying in radio: If no one is calling to complain, then nobody is listening. So when Science360 Radio received a phone call from someone who was upset because she suddenly could no longer access the online radio channel, that was, oddly, a good thing. It turns out the person calling had purchased a new smart phone specifically to listen to Science360 Radio—even better! Indeed, it appears the first Internet radio stream dedicated to programming about science, technology, engineering, and math (STEM) has a loyal and growing group of listeners. Since the National Science Foundation (NSF) launched Science360 Radio in September 2011, the number of listeners has grown to 7,300 a week, and 21,000 people have downloaded the app.