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[English]Why do maple and oak trees drop their leaves in the fall? What other animals share the forest with chipmunks, deer, and snakes? Hike through this book, and find out what makes temperate deciduous forests one of Earth's treasures. [Spanish]¿Por qué al arce y al roble se les caen las hojas en el otoño? ¿Qué otros animales comparten el bosque con las ardillas listadas, los venados y las serpientes? Da un paseo por este libro. Descubrirás por qué los bosques templados son uno de los grandes tesoros de la Tierra.

A teen is trapped in an abusive relationship, and a friend wants to help. This comprehensive book shares how to spot the warning signs of an abusive relationship, how to be supportive of a friend who needs help, and what kind of resources are available to both the helper and the victim. It may be scary to deal with a friend in an abusive situation, but this informative guide will be a strong tool in letting readers know how practical ways that they can navigate a difficult situation and give their much-needed support.

Grouping and classification are among the first math and science skills that children need to learn. This fun book will challenge children to observe natural creatures to see what makes them the same and different. It presents an interesting way of looking at objects, because the objects may not be exactly the same. For example, birds have two wings, but the wings of different birds may not look similar.

Los sistemas de las aeronaves han sido un tema poco estudiado en las academias de vuelo. Lo cierto es, que un piloto debe conocer a cada uno de los sistemas de su avión, antes de iniciar sus primeros vuelos. En esta obra, aprenderás todo sobre los sistemas básicos de las principales aeronaves ligeras, o de pequeño porte. Tren de aterrizaje, neumáticos, controles de vuelo, combustible, electricidad, cables y mandos de control, superficies móviles, y todos los principales sistemas que componen el equipamiento de tu aeronave. El aprendizaje de los sistemas del avión debe darse al...