Examines the economy of the Aztec civilization, looking at the goods they produced, how they were traded, how wealth was distributed, and the work that people did.
Describes the evolution and roles of horses throughout history, from the earliest horses that existed in prehistoric times, to the horses used as transportation in the historic period, to the work and
This stellar expedition focuses on different aspects of the solar system to illustrate which strategies would be most efficient for problem solving. Uses interesting examples to relay concepts, such
Introduces the cuckoo birds, discussing their physical characteristics, habitats, and unusual habit of some cuckoos to lay their eggs in another bird's nest.
Every man and woman who steps forward to fight for the freedom and lives of others can be called a hero. Many members of the air force have exceeded even that high calling and have performed such cour
