Aves

Our closest solar system is about 10 light years away. It has two main types of planets. Some are rocky and small, like planet Earth, while others are huge balls of gas, like Jupiter. Learn about how astronomers once thought our solar system was the one and only, to how they have now discovered hundreds of stars with planets orbiting them, which means there could be billions of solar systems in outer space! Just maybe, these alien worlds could host life, like our own amazing planet. This book allows students to use observations of the Sun, moon, and stars to describe patterns that can be...

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.

¿Sabías que a Las Ratitas les encanta jugar con la nieve? Por eso sus padres deciden aprovechar las vacaciones de invierno para llevarlas a un lugar superespecial: el Pueblo de la Nieve. Está en una montaña y es famoso por sus esculturas de hielo y su concurso de muñecos de nieve. Ahí, Claudia y Gisele vivirán una aventura llena de acción y de magia. ¿Quieres saber lo que les ocurre a Las Ratitas en la montaña nevada? ¡No esperes más y léelo ya!

Explains the basic science of flight, the problems of getting vehicles into the air, different types of engines, and aircraft design, and includes instructions for making aircraft models.