A look at the causes and global effects of the 1969 moon landing, which led to further space exploration and eventually encouraged international cooperation rather than competition.
A look at a common food chain in the Rocky Mountains, introducing the ponderosa pine tree that starts the chain, the mountain lion that sits atop the chain, and various animals in between.
A helpful guide for understanding the mathematical concepts and real-world applications of graphs and diagrams, including classroom tips, common terms such as variables, and exercises to encourage hands-on practice.
An account of espionage during the modern age, including famous spies such as Dayna Williamson Baer, covert missions, and technologies that influence the course of present-day conflicts.
An in-depth look at the people and policies behind the government agency known as the NTSB, from its founding in 1967 to the controversies and challenges it faces today.
Imaginative creatures present all the colors of the rainbow, identify primary colors, and illustrate how three colors can make countless others in this one-of-a-kind introduction.