1991 May 16. Part of: Paul B. MacCready Papers ca. 1930-2002. Series 7: Audio-Visual material; Subseries 3: Videos and Audio; Box 17, Folder 8, Created by Chevron. Paul MacCready lecture on energy usage and how to create vehicles using cleaner sources of energy. He discusses the importance of aerodynamics and his major projects Gossamer Condor, Gossamer Albatross.