Preocupación

This book provides an introduction to the Spanish language, showing where it is spoken and who speaks it, differences and similarities between Spanish and English, and introducing some key basic vocabulary and phrases.

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...

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.

Cuando Paula, una niña inquieta y curiosa, conoce al Guardián del Tiempo no se imagina la gran aventura que la espera. Ambos viajan cuatro mil quinientos años hacia el pasado y la pequeña se sumergirá de lleno en la época del Neolítico. ¿Qué singulares aventuras le esperan a la intrépida protagonista? Una historia de amistad, valentía y superación de dificultades.

This informative Spanish-translated book gives readers a look into the Constitution and the Bill of Rights. Readers will learn about the three branches of government--executive, legislative, and judicial--as well as the way each of those branches works to keep order and the various aspects including Congress, the Supreme Court, the House of Representatives and the Senate. Featuring detailed images, stunning facts, and supportive text, this book will have readers interested, engaged, and eager to learn more about the development of the Constitution. Other featured topics include the Federalist ...