Many things that are part of everyday life--such as viruses, bacteria, and our own DNA--cannot be seen with the naked eye. Many more, including bugs and minerals, must be viewed under a microscope to see in detail. Through accessible main text, augmented with engaging fact boxes and in-depth sidebars, readers learn about the microscopic world around us. This knowledge is crucial to creating an informed view of health risks and benefits. It also forms the foundation for more advanced scientific study. A list of related websites and books provides a starting point for further independent research.