Exploring the radio spectrum [Spectral Lines]

In ancient times, before the Internet, the terms "print media" and "broadcast media" were pretty literal descriptions of the two main kinds of news organization. But journalism\´s steady migration to the World Wide Web has blurred the lines considerably. Nowadays, traditional broadcasters are putting up text stories and blogs on their websites. And IEEE Spectrum and other historically print-centric media are producing videos, podcasts, slideshows, and radio shows. Each of Spectrum\´s radio segments, in fact, is being broadcast to some 4 million listeners across the United States via stations syndicated through the country\´s NPR network.