A look at a common food chain on a North American prairie, introducing the bluestem grass that starts the chain, the badger that sits atop the chain, and various animals in between.
A look at a common food chain in the Pacific Ocean, introducing the plankton that starts the chain, the killer whale that sits atop the chain, and various animals in between.
A look at the causes and global effects of the 1789 storming of the Bastille and subsequent decade-long revolution, which toppled a monarchy but paved the way for Napoleon’s rise to power.
A look at the causes and global effects of the 1945 atomic bombardment of two Japanese cities, which led to the end of World War II but set the stage for hostilities in the Cold War era.
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 the causes and global effects of the World War II Nazi campaign against Jews and other groups of people, which led to millions of deaths and the creation of a Jewish homeland.
A look at a common food chain in a North American desert, introducing the mesquite tree that starts the chain, the coyote that sits atop the chain, and various animals in between.
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 look at a common food chain in the Arctic tundra, introducing the Arctic willow that starts the chain, the wolf that sits atop the chain, and various animals in between.
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.
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 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.
An exploration of Grand Teton National Park, including how its mountainous landscape was formed, its history of preservation, and tourist attractions such as the waterfall known as Hidden Falls.
A look at the origins, leaders, growth, and innovations of Facebook, the online social networking service that was founded in 2004 and today has hundreds of millions of users worldwide.
A history of the bathyscaphe Trieste's 1960 descent to the bottom of the ocean, detailing the challenges encountered, the individuals involved, the discoveries made, and how the expedition left its mark upon the world.
A history of America's famed Apollo 11 mission to the moon in 1969, detailing the challenges encountered, the individuals involved, the discoveries made, and how the expedition left its mark upon the world.
A history of Roald Amundsen's successful 1911 trip to the South Pole, detailing the challenges encountered, the individuals involved, the discoveries made, and how the expedition left its mark upon the world.
A compelling look at the Mongols, including how they built the most widespread empire in history, their lifestyle, their weapons, and how they remain a part of today's culture through books and film.
A history of Edmund Hillary and Tenzing Norgay's 1953 summit of Mt. Everest, detailing the challenges encountered, the individuals involved, the discoveries made, and how the expedition left its mark upon the world.
A history of David Livingstone's 19th-century excursions into the African interior, detailing the challenges encountered, the individuals involved, the discoveries made, and how the expeditions left their mark upon the world.
A compelling look at the Vikings, including the ways they terrorized western Europe, their lifestyle, their weapons, and how they remain a part of today's culture through books and film.
A history of Meriwether Lewis and William Clark's famed 1804-06 journey, detailing the challenges encountered, the individuals involved, the discoveries made, and how the expedition left its mark upon the world.
A look at the origins, leaders, growth, and products of Amazon.com, the electronic commerce company that was founded in 1994 and today is the largest online retailer in the United States.
A look at the origins, leaders, growth, and products of Apple, the consumer electronics company that was founded in 1976 and today manufactures some of the world's most popular computer products.
A compelling look at barbarians, including their clashes with the Greek and Roman empires, their lifestyle, their weapons, and how they remain a part of today's culture through books and film.
