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.

Which things move slowly? Read this book to find out about how and why things move slowly. Books in this series introduce children to simple forces. Each book uses simple, repetitive text to teach children basic vocabulary, and includes stunning photographs that show how different forces are at work in the world around us. In Slow, children learn about things that commonly move slowly, how pushes and pulls can make something move slowly, and how some things are slower than others.

"Simple text and color photographs introduce kinds of motion, including motion powered by wind, water, and electricity--in both English and Spanish"--

First readers will begin to learn and identify shapes, which are the building blocks for learning math.

Bacca tiene todo lo que uno puede desear. Es una de las estrellas más brillantes (y peludas) del Overworld. Es el maestro al que todos acuden para que los ayude a construir sus mazmorras, laberintos y castillos. Tiene una preciosa novia, LadyBacc. Y un arma de la que se siente orgulloso: un hacha de diamante a la que llama Betty. Un día, Bacca se encuentra con un dragón misterioso... ¡hecho enteramente de diamantes! ¿Se atreverá a poner en riesgo su vida para cumplir la misión? Como sus millones de fans en YouTube habrán imaginado... ¡por supuesto que sí! ¡Es Bacca!