La Verdadera Ciencia de la Invisibilidad

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.

Dexter is displeased. Like any self-respecting, totally decent, soundly homicidal guy, Dexter Morgan takes great pride in his work and is careful to remain anonymous. As his colleagues grow more paranoid of the killer in their midst, Dexters position is increasingly perilous. He is running out of time to track down this copycat.

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.

Although Earth is mostly made up of igneous and metamorphic rock, sedimentary rock covers about 75 percent of Earth's land surface. This means it's the most visible kind of rock on Earth. Sedimentary rocks form when sediment accumulates and compacts. Your readers will learn how sedimentary rocks form, the different types of sedimentary rocks, and how people use sedimentary rocks. Fun fact boxes provide readers with additional information. A helpful diagram illustrates how sedimentary rocks form.