How Do You Measure Time?

Though few may know his name, his achievement as the first European to discover San Diego Bay and many other areas on the California coast enshrines his name in the annals of American history. This exciting volume tells Cabrillo's story from an unknown soldier to the intrepid conquistador, crossbowman, landowner, shipbuilder, and explorer he became. As one of Hernan Cortes' soldiers during the conquest of Mexico and a founder of Guatemala, his actions loomed large in the future of both South America and North America. By both educating and entertaining, this biography illuminates a...

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 investigate what's wrong with a microscope and learn how to fix it. This nonfiction book is paired...

"I support the freedom to marry for all. That's what Loving, and loving, are all about." -- Mildred Loving, June 12, 2007 Esta es la historia de una familia valiente: Mildred Loving, Richard Perry Loving y sus tres hijos. Es la historia de cómo Mildred y Richard se enamoraron y se casaron en Washington, D.C., pero, al regresar a su pueblo de Virginia, fueron arrestados (de manera dramática) por violar las leyes de ese estado contra el matrimonio interracial. Los Loving se rehusaron a que sus hijos crecieran creyendo que el amor de sus padres era incorrecto, así que litigaron la injusta ley ...

The sun is responsible for all life on Earth, but what exactly is it? Our star is an amazing force that can be as dangerous as it is important. From solar flares to the threat of blowing up altogether, the sun is one of the most interesting things in our solar system. Readers take a trip to the sun to see how it works and exactly what it is made of. Theyll learn about the life cycle of a star and see just how long we have until we have to find a new planet to call home. Dont worry, theyll be happy to learn that (hopefully) we have millions of years left!