The series is written at a level that any adult can understand, even with no prior training or college coursework in science. Content is written in a clear style, with every term and concept defined and explained in its place. The pace is unhurried, and examples make the science vivid and practical. Optional mathematical sections are included for interested readers and the appendices provide more in-depth information on topics such as units of measure and unit conversions. Historical passages blend enriching accounts of scientists and the adventures that scientific discoveries often involve.