Construir un auto de carreras: Comprobar tu trabajo (Building a Race Car: Checking Your Work)

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.

Mariana the the sea turtle and her fellow hatchlings have an adventure on their first trip to the ocean.

La Ciudad de Massi ha sido arrasada, un auténtico caos se ha desatado en sus calles. Edificios en llamas, aldeanos corriendo como locos, y una tétrica banda sonora compuesta por gritos de terror y sirenas de ambulancia. ¿Quién ha podido provocar semejante apocalipsis? Aunque parezca mentira, el propio Massi es el principal sospechoso. Varios testigos aseguran haberlo visto. Sí, sí, era él, claramente: con su inconfundible armadura negra y amarilla. Massi no recuerda casi nada de la noche anterior: un atracón de jalapeños lo dejó completamente grogui. Solo recuerda haber hecho un...

Correlated to the science curriculum, our Spanish-language series describes how the types of homes that different animals build reflect adaptations to their environments. Through simple, easy-to-follow text, each volume looks at each type of home as a shelter from predators and weather and a place to store food and raise young. Young readers also learn how animal homes and human homes fulfill similar needs and functions.