Half of the world's population relies on burning wood or dung to cook, exposing them to indoor air pollution. Nearly 1.2 billion people lack access to clean drinking water, and over 1 million children die yearly from unboiled water. Solar cookers provide a safer alternative that can help address these issues by heating food and water without fuel or fire. The document outlines the basic principles of collecting, absorbing, and retaining heat for solar cooking and provides examples of simple, inexpensive box, panel, and funnel cooker designs that are easy to build and use.