Obedecer las reglas

¿Qué significa migrar? Descubra qué animales migran y por qué migran a través de fotografías detalladas y texto simple. What does it mean to migrate? Discover which animals migrate and why they migrate through detailed photographs and simple text.

Summarizes how water changes from a solid to a liquid and back again, and introduces related facts such as that water freezes at thirty-two degrees Fahrenheit and that ice floats.

Repleto de ilustraciones en 3D, Animales acerca al lector a un mundo en constante evolución para descubrir cómo vive y cómo se relaciona con su entorno cada habitante del planeta. Animales está lleno de divertidas curiosidades y datos relevantes de especies de todo el reino animal: desde las alas de un espectacular albatros a la majestuosidad del tiburón blanco, el libro es un repaso por todas las especies que conforman cada ecosistema por remoto que sea. Descubre todo tipo de animales, desde la diminuta pulga de agua hasta la gran ballena azul. Observa la vida animal en sus detalles...

Germs Are Not for Sharing/Los gérmenes no son para compartir paperback (ages 4–7): Sneezes, coughs, runny noses, spills, and messes are facts of everyday life with young children. This book teaches kids what germs are, what they do, and why it’s so important to cover them up, block them from spreading, and wash them down the drain. Includes tips for parents and caregivers.

The era of Anglo-American colonization, while brief, had a great impact on the development of Texas and the United States. Readers will discover what drew Anglo-American settlers to Texas, and what caused hostilities to rise between them and the Mexican Government. Frequent sidebars introduce readers to the key figures of this era.

"Some things are so huge or so old that it's hard to wrap your mind around them. But what if we took these big, hard-to-imagine objects and events and compared them to things we can see, feel and touch? Instantly, we'd see our world in a whole new way." So begins this endlessly intriguing guide to better understanding all those really big ideas and numbers children come across on a regular basis. Author David J. Smith has found clever devices to scale down everything from time lines (the history of Earth compressed into one year), to quantities (all the wealth in the world divided into one...