Similar Material w56 2/15 pp. 99-100 Do You Believe Only What You Can See? How Does Your Radio Work? Awake!—1970 Why Believe in a God We Cannot See? The Watchtower Announcing Jehovah’s Kingdom—1977 Radio—An Invention That Changed the World Awake!—1996 Waves of Energy Awake!—1974 Listening to the Universe Down Under Awake!—2003 God—Does He Really Exist? Awake!—1986 What the Unaided Eye Cannot See Awake!—2000 Where We Get Our Power Awake!—1972 How to Cut Down on Your Electric Bills Awake!—1975 Electricity—A Useful Friend That Demands Respect Awake!—1985