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.

A selection of dazzling, full-color graphic novels offer an appealing way to deliver social studies content, chronicling the lives of inspiring individuals, from important historical figures to famous musicians.

A closer look at the stomach and how it works with the digestive system to give the body the nutrients it needs to stay healthy.

Científico, pintor, médico y naturalista, las "Cartas sobre la pintura de paisaje" de Carus desbordan los límites de una canónica artística al uso y nos sitúan en el centro de la concepción románica de la naturaleza. No sólo porque exponen con precisión -no exenta de los recursos retóricos de época- las ideas centrales del paisajismo romántico de la primera mitad del siglo XVIII, también porque establecen con nitidez la relación entre arte, estética y ciencia, y , en todos los casos, la relación del hombre con la naturaleza. En palabras de Carus: =por ellas y mediante ellas...

Internet security breaches have been in the news of late. Organizations, governments, businesses, and individual internet users are all at risk. This book introduces readers to the importance of cybersecurity and addresses the current risks from hackers, viruses and other malware, identity thieves, and other online perils. It provides concrete measures that young digital natives can take to protect themselves and their computers, smartphones, and other devices. This volume's lively, cautionary narrative and useful tips will help readers effectively defend their identities and data.