¿Foca o león marino? (Seal or Sea Lion?)

Mrs. Frizzle's class investigates the disappearance of the salmon from the sea and in the process learn about migration.

Immigrants help make the United States a special place. Learn all about the history of immigration to the United States as you sharpen your data measurement skills! This Spanish math book seamlessly integrates the teaching of math and reading, and uses real-world examples to teach math concepts. Text features include images, a glossary, an index, captions, and a table of contents to build students' vocabulary and reading comprehension skills as they interact with the text. The rigorous practice problems, sidebars, and math diagrams extend the learning experience and provide multiple...

This book is a comprehensive, practical presentation of the principles of behavior modification and guidelines for their application. It teaches forms of behavior modification ranging from helping children learn necessary life skills to training pets, to solving personal behavior problems.

En un crudo día de invierno de 1650, René Descartes fue enterrado lejos de su hogar. Dieciséis años más tarde, el embajador francés exhumó secretamente sus huesos y los transportó a Francia. La historia de estas insólitas reliquias involucra a los personajes más diversos que usaron estos huesos.