Why are we still listening to the radio in 2013, to an outdated technology that has hardly changed in manufacture or output since it first appeared in the 1920s? How come TV did not wipe it out, as CDs wiped out the cassette and DVDs put paid to video? My guess is that it’s because sound was more important to us when we first came into the world and our eyes were still too blurry to take in much of what was going on.