Lo que los fósiles nos enseñan sobre la Tierra (Investigating Fossils)

Advances in science have changed our world, all thanks to the scientists behind important discoveries. Some of the most important discoveries have come from female scientists, who were as unique for their work as they were for being trailblazers in a male-dominated industry. This text offers a biographical treatment of such important scientists as Marie Curie, Rachel Carson, and Jane Goodall, as well as others who have made it possible for women of the future to have a career in science. Age-appropriate text, fact boxes, historical and modern images, and a comprehensive timeline complete the...

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.

Think there's just one fairy tale with a beautiful girl and an evil stepmother? Think again! Cultures all around the world have their own Snow White stories. Visit Albania, Germany, Mozambique, and Turkey, and find out who meets 40 dragons instead of "seven dwarfs," and on whose forehead a bright star shines. Fully translated Spanish text.

Todos los objetos, elementos o personas tienen una silueta que los define y que constituye su figura. Hay muchísimas figuras posibles, pero todas tienen unas particularidades que permiten identificarlas. Los 12 ejercicios del libro están pensados precisamente para trabajar las características de esas figuras haciendo, por ejemplo, la silueta de una silla con una serpentina, o construyendo la figura de una pelota a partir de diferentes trozos de papel rasgado. Asimismo, muchos de los ejercicios del libro se detienen en las propiedades de la figura humana para conocer sus partes más...

Games and projects introduce the concepts of coordinates and angles and how to find location and position.