La sonrisa de la hiena

Over the years, people have looked for ways to improve our imperfect sight. This has led us to the world of optics, which is the study of light and how it travels. What are some of these innovations that have changed how we see the world, and how do they work? Find the answers to these questions with this Smithsonian Informational Text! Created in collaboration with the Smithsonian Institution, this text builds students' reading skills while engaging their curiosity about STEAM topics through real-world examples. It features a hands-on STEAM challenge that guides students through every step...

Martín De León was the only Mexican empresario to found a colony in Texas. This book also details De León’s integral role in the development of the cattle industry, along with other accomplishments that have made him a compelling figure in Texas history.

The story of British soldiers killing five civilians in Boston and injuring many others during the spring of 1770. In graphic novel format.

What are aircraft? -- What do aircraft look like? -- What are aircraft made of? -- How did aircraft look long ago? -- What is an airplane? -- What is a jet? -- What is a helicopter? -- What is a glider? -- Quiz -- Picture glossary.