La historia de los sistemas numéricos: Valor posicional (The History of Number Systems: Place Value)

The idea of the Roaring '20s conjures up images of speakeasies, women with short, saucy hairdos, and hot jazz. Readers will learn about the historical events that define this decade, including the devastating war that preceded it. An explanation about project-based learning will help readers understand how it can help them research their topic in unique and interesting ways. Constructive suggestions offer ideas for projects, while encouraging readers to take their studies in new and interesting directions.

This illustration-packed book begins with a brief overview about the history of the theater and then delves into the sets, actors, and audiences for Shakespeare's plays. It even talks about the famous fire at the Globe Theater and what life was like in London during the Plague. A detailed chronology is included.

Now available in Spanish bilingual editions, this best-selling series offers big, brainy science for the littlest listeners. Accurate enough to satisfy an expert, yet simple enough for baby, this clever board book explores the ups and downs of gravity. When baby drops food from a high chair, why does it fall? Beautiful, visually stimulating illustrations complement age-appropriate language to encourage baby's sense of wonder. Parents and caregivers may learn a thing or two, as well!

A soldier, a farmer, a governor, and an explorer, Juan Ponce de León made his very first voyage with the famed Christopher Columbus. As an explorer, Ponce de León may be better known for what he didn't discover the fabled fountain of youth than for what he did discover Florida!