Tigre dientes de sable (Smilodon)

Un cómic sobre los mamuths y su más grande depredador: el homo sapiens. Ser un mamuth no era nada fácil. Había que buscar comida entre los amplios y fríos pastizales del norte, huir de las heladas y sobrevivir a todos los depredadores que te veían como platillo principal. Si no era una manada de dientes de sable quien te acechaba, era una de homo sapiens. Mamuth narra en formato de cómic la difícil vida de esta especie, perseguida por los antiguos humanos, y cuya extinción, se sospecha, fue causada por su caza desmedida.

When President Thomas Jefferson bought the Louisiana Territory from cash-strapped France in 1803, he doubled the size of the United States without really knowing what he was getting. He dispatched Meriwether Lewis and William Clark and their Corps of Discovery to explore a territory that would include part or all of fifteen future states and to seek a water route to the West Coast. Westward expansion began immediately, all for the bargain price of 15 million dollars. This book richly explores this fascinating part of history.

Universo is one book in the Spanish-language Gran Atlas de la Ciencia series that covers today's most popular science topics, from digital TV to microchips to touchscreens and beyond. Perennial subjects in earth science, life science, and physical science are all explored in detail. Amazing graphics--more than 1,000 per title--combined with concise summaries help students understand complex subjects. Correlated to the science curriculum in grades 5-9, each title also contains a glossary with full definitions for vocabulary.

If you look close enough, a butterfly can grow up right before your eyes. Through the use of accessible text, readers take an exciting look at the journey butterflies make. A picture glossary helps beginning readers strengthen their vocabulary skills, and vibrant, full-color photographs show caterpillars grow to adulthood, taking flight to travel around the world.

Young children are natural problem-solvers and always looking for answers, especially when it involves interesting animals. This Spanish-language edition of Scaly Swimmers provides young curious readers with striking visual clues and simply written hints. Using the photos and text, readers rely on visual literacy skills, reading, and reasoning as they solve the animal mystery. Clearly written facts give readers a deeper understanding of how the animal lives. Additional text features, including a glossary and an index, help students locate information and learn new words.