Bill Nye visits Hoover Dam and takes to jackhammering concrete blocks to explore different types of pressure, while special equipment enables him to scuba dive and explain the effects of pressure underwater. In this powerful program, check out fire boats, fancy car hydraulic lifts, and a water jet ski shop that pushes water at three times the speed of sound to cut through wood, granite, and even titanium. The DVD has extra features: fully indexed "chapters" correlated to national science standards, interactive glossaries and quizzes, bonus footage of never-before-seen segments, interviews and demos, Spanish translation, and on-disk implementation guide. .