"What are the tallest living things on Earth? Trees! Discover what growing trees need so they can rise to the sky in this lyrical look at the tree life cycle"--

In the icy waters of the Pacific, a massive humpback whale unexpectedly finds herself tangled in a net abandoned by fishermen. When a rescue boat and a convoy of divers arrive to help the struggling humpback, a realistic and moving encounter bridges the human and aquatic worlds.

"A non-fiction introduction to the massive scale of the known universe"--

Born in Ghana, West Africa, with one deformed leg, he was dismissed by most people--but not by his mother, who taught him to reach for his dreams. As a boy, Emmanuel hopped to school more than two miles each way, learned to play soccer, left home at age thirteen to provide for his family, and, eventually, became a cyclist. He rode an astonishing four hundred miles across Ghana in 2001, spreading his powerful message: disability is not inability. Today,...

Includes articles, games, poems, and suggestions for projects based on American history.

Meet Mars! The red planet. Planet Marvelous. Favorite sibling of Earth (or so he claims). Sometimes they're close (just 34.5 million miles apart). Sometimes they need space (250 million miles apart)! Earth and Mars have a lot in common--clouds, mountains, polar icecaps. And while Earth has Earthlings, Mars makes a persuasive case for why people should make the journey to spend time with him. His day is 7 minutes longer! He is home to the largest volcano...

"Full-color portraits illustrate the stories of ten people-rulers, educators, inventors, scholars, and explorers-who helped shape the African continent and the world from ancient times through the tumultuous sixteenth century"--

"Step into the world of ancient Rome and meet its emperors, gods, soldiers, and gladiators. Who were Rome's most famous emperors? What was everyday life like for a soldier in the Roman army? How did the citizens of ancient Rome live? Did gladiators really fight to the death in the mighty Colosseum? Find out the answers to all these questions, and many more, in Eyewitness Ancient Rome. Photographs of real artefacts and detailed illustrations will help...