El Arbol del Tiempo

La Asociación Española de Sexología Clínica ha escrito los textos de esta colección con el fin de responder a la curiosidad de los niños y enseñarles de una forma natural, adaptando cada cuestión a su edad y explicando las cosas de un modo sencillo, aunque riguroso, acompañado además de graciosas ilustraciones. Este libro responde con seriedad a las falsas creencias sobre el sexo, indaga en los distintos tipos de familias y enseña a enfrentarse a un posible abuso sexual.

Entering a city oppressed by a High Epic despot is risky, but David's willing to gamble. Because killing Steelheart left a hole in David's heart. A hole where his thirst for vengeance once lived. Somehow, he filled that hole with another Epic--Firefight. And now he will go on a quest darker and even more dangerous than the fight against Steelheart to find her.

On a clear night, you should be able to see the stars. But we cannot always see them. Light pollution prevents us from seeing the stars and causes other problems as well. Learn about light pollution with this STEAM book that will ignite a curiosity about STEAM topics through real-world examples. Created in collaboration with the Smithsonian Institution, it features a hands-on STEAM challenge that is perfect for makerspaces and that guides students step-by-step through the engineering design process. Make STEAM career connections with career advice from actual Smithsonian employees working in...

Imagine traveling at half the speed of a jet plane without ever leaving the ground! Students will discover the technology that makes such speeds possible, from special tracks and safety precautions to aerodynamically designed trains. What are the limits to the speed of trains? What imposes those limits? Students also will read about the future of passenger train travel, from flying trains to trains that use huge magnets to levitate inches or centimeters off the track. Some trains safely reach speeds of more than 200 mph!