Agujeros negros (Black Holes)

For many years, people believed there were nine planets that orbited the sun. Now we say there are eight. What happened to the ninth planet, Pluto? What are the different planets like? What exactly makes a planet a planet? These are the many intriguing questions answered with this high-interest book, crafted to be accessible for readers of all levels. Young astronomers will be especially fascinated by the stunning photographs and the "Make the Grade" fact boxes.

"Brief text introduces the concepts of long and short, comparing some of the world's longest animals with animals that are short -- in both English and Spanish"--Provided by publisher.

Life in the Southern Hemisphere is bitterly cold for most penguins, but they don't seem to mind. Most penguins live in large colonies on the coast of Antarctica or on nearby islands. Readers explore penguin colonies for themselves, learning fun facts about these beautiful birds with the help of accessible text. Readers learn how penguin families work together to feed their young and keep them warm. A helpful graphic organizer aids in reader understanding. Readers will enjoy detailed images of penguin species at home in the Antarctic with every turn of the page.

Se puede maniobrar a traves de cada rincon y grieta de este libro de laberintos? Para ello, debe tener buen motor fino y control visual del motor. Esto solo pueden hacerse a traves de la practica frecuente. Este libro le proporcionara las mejores herramientas de la practica. Ademas, laberintos tambien ayudara con las habilidades de funcionamiento ejecutivas como el intercambio de ideas y planificacion. Adelante, agarra una copia de este libro hoy.

Computer science is all around us, at school, at home, and in the community. This book gives readers the essential tools they need to understand the computer science concept of debugging. Brilliant color photographs and accessible text will engage readers and allow them to connect deeply with the concept. The computer science topic is paired with an age-appropriate curricular topic to deepen readers’ learning experience and show how debugging works in the real world. In this book, readers will find out why a magnet isn't sticking to a certain surface. This nonfiction title is paired with...