Edward Tufte is a famous critic of PowerPoint presentations. He believes PowerPoint simplifies ideas and turns facts into slogans. The document discusses how PowerPoint presentations are overused, with over 500 million users creating boring, template-driven slides with animations and transitions. It notes that the Columbia shuttle disaster investigation and Iraq war invasion were presented via PowerPoint, showing its limitations. Alternatives to PowerPoint discussed include chalkboards, flipcharts, interactive whiteboards, Google Docs, Prezi, and supplementing with tools like Infogr.am and Visual.ly. The document concludes that PowerPoint itself is not evil if used properly alongside other visual aids.