Explores the history of guide dogs, service animals, and assistance dogs, and discusses the process of training them to help people who have physical disabilities.
Examines archaeological excavations of the watercraft of ancient Native Americans and what the findings tell us about the daily life and culture of people who lived thousands of years ago.
Discusses non-native plants, such as the kudzu vine and the tree-of-heaven, which were imported from other countries and now pose a significant threat to the ecosystems of North America.