Radio, a wonderful invention that A music, stories and news into our homes, has a long history that begins with the discovery of invisible waves called radio waves. B waves, which travel through the air, can carry sounds over long distances. C the 19th century, pioneers like Guglielmo Marconi experimented with radio waves and successfully transmitted the D messages. By the 1920s, radio became an essential part of everyday life. Families gathered around the radio, listening to their favorite shows, learning about news and enjoying music. Over the years, technology E allowing us to listen to radio in our cars and smartphones.