Visual Aid Virtuosity
http://www.presentersuniversity.com/courses_visual_aids_visuals_virtuosity.php

Miller, Anne
Presenters University
2002

Abstract:

Einstein said, If I can't 'see' it, I don't understand it. When visuals are used, you are more persuasive, you can cover more ground in less time, retention and comprehension are greater and, your presentation is more interesting and involving.