Andrew Dunn

Describes how simple machines utilize the principle of the slope or incline to plow fields, unlock doors, and lift heavy loads.

Backpackers on Wheels is a manual for travel organizing, essentially a "how-to" guide. It is directed at first-time travelers and experienced travelers alike. First-time travelers will benefit from this book by avoiding potholes in organizing their travel. Experienced travelers will benefit from this book by streamlining their travel arrangements and perhaps widening their travel horizons. This book is a practical guide to contemporary travel in a...

Explains how air and water pressure work and how they are used in machines.

Discusses the aesthetic and practical values of skyscrapers and the technology used to build them.

Describes simples machines which utilize the principle of levers to move heavy objects, cut material, and make music.