Explores the importance of the petroleum industry to the global economy, discussing alternative energy sources as well as how to maintain oil consumption and preserve the environment.
Offers teenagers advice on how to cope with bipolar disorder and manic-depression, discussing the illnesses' causes, symptoms, diagnosis, and treatments.
Chronicles the history of guilds, discussing their importance to life in the Middle Ages, features brief descriptions of typical guilds, and includes instructions and recipes for crafts and foods such as those made by guilds.