Criptología digital (Digital Cryptology)

Animal keepers have developed innovative ways to help zoo animals learn and grow. Learn how zookeepers keep animals healthy and happy with this fun and informative book. Created in collaboration with the Smithsonian Institution, this STEAM book will ignite a curiosity about STEAM topics through real-world examples. It features a hands-on STEAM challenge that is perfect for makerspaces and that guides students step-by-step through the engineering design process. Make STEAM career connections with career advice from actual Smithsonian employees working in STEAM fields. Perfect for English...

HIGH-INTEREST, LOW-LEVEL: Reluctant readers will be engaged from beginning to end as they explore the responsibilities and skills of the catcher in this 32-page nonfiction book. Side-by-side English and Spanish text and vivid, exciting photos show readers what it takes to fill this key position in baseball and softball. SPORTS BOOK FOR KIDS: Catchers squat and they throw. They often call the shots. But most importantly, they catch the ball! From catching fastballs to throwing out base runners, learn why catchers have the toughest job in baseball and softball. INCLUDES: Readers will be hooked...

What does masculinity or being a boy mean in this society? If you are a boy, or ever were, The Golden Book of Boys contains words and images that will help you remember how powerful you are, but powerful in a different way than you may have been told until now... It is a book against the tide. A strange book. A journey back to how wonderful you are. A book that invites you to respect yourself, to obey yourself and to be yourself (something that nobody usually tells us). Maybe it will help you to remember how wonderfully vulnerable you are and to heal old wounds.

Five and counting! So far, astronomers have discovered five dwarf planets in our solar system. Pluto, which was once thought of as the ninth planet, is today classified as a dwarf planet. This book looks at the current dwarf planets, characteristics, size, and orbital patterns, as well as the three rules scientists follow to characterize these tiny, round space objects. Every day new discoveries are being made. Who knows how many dwarf planets we will find in the future! This book will allow students to understand that patterns in the natural world can be observed, used to describe phenomena, ...