Cobayos

Black holes are neither holes nor black. They're invisible and packed with matter! Future astronomers will find out many more fascinating facts about these space phenomena with this intriguing book. Carefully crafted text encapsulates the most important information about black holes, such as how scientists locate them and their significance in a star's life cycle. Amazing photographs support critical concepts and inspire a true appreciation of the spectacles of space.

Ser casi adolescente puede resultar muy fastidioso. Nadie lo sabe mejor que Greg Heffley , inmerso en el duro ambiente del colegio, donde los chicos bajitos que aún no han dado el estirón tienen que compartir los pasillos con grandulones que ya se afeitan dos veces al día. En Diario de Greg, el escritor y dibujante Jeff Kinney nos presenta a su antihéroe. Como este dice en su diario: No creas que voy a estar todo el tiempo “Mi querido diario por aquí” y “Mi querido diario por allá”. Por suerte para todos, lo que Greg Heffley dice que va a hacer y lo que realmente hace son cosas...

People all over the world love pets. Some pets are popular in certain areas of the world. Let’s find out about the popular pets around the world. Paired to the fiction title The Perfect Pet.

Find out how tools have helped people hunt, build, and make life easier in this engaging, Spanish-translated nonfiction title. With colorful images, timelines, charts, a glossary to assist with vocabulary improvement, and an index, children will learn how tools throughout time have made such an important impact on life as we know it! Featured eras include the Stone Age and the Industrial Revolution.