Similar Material g89 4/22 p. 31 A Milestone in Aviation New Aviation Fuel? Awake!—1980 What New Developments in Energy? Awake!—2005 What Can Be Done? Awake!—1989 A Source of Energy Awake!—1970 The Shuttle—A New Approach to Space Awake!—1981 How Did the Airplane Arrive? Awake!—1999 Fossil Fuels Awake!—1980 Chaotic Weather Awake!—1998 What Is the Greenhouse Effect? Awake!—1989 What Does It Take to Keep Them Flying? Awake!—1999