Las aventuras de la muela Sally

History is full of unsolved crimes, mysterious disappearances, and strange sightings. Readers will discover some of the most well-known mysteries in history--including Amelia Earhart, Big Foot, and the Salem Witch Trials--in this fascinating, Spanish-translated nonfiction book. Featuring detailed images, intriguing facts, and informational text in conjunction with a glossary of terms and an index, readers will be enthralled from beginning to end!

This complete Spanish translation of the highly acclaimed Isaac Asimov's 21st Century Library of the Universe is ideal for students still developing their English-language skills.

Explains the importance of the skeleton in overall health, and describes how to keep the structure healthy.

For ages, the idea of machines that think and act on their own has gripped scientists, thinkers, and the general public. This book explores the history of artificial intelligence (A.I.), and how science fiction is quickly becoming science fact. It examines the technologies involved in A.I. and its inevitable effects on work, life, health, and many other aspects of human society. Rooted in history and science, this book provides an inside look at a topic that captivates engineers, scientists, and dreamers, but also raises important ethical issues and challenges how we see ourselves and our...