Where did our universe come from? People have been trying to answer this question for thousands of years. The twentieth century brough new discoveries in physics and astronomy that led scientists to develop the Big Bang theory-a detailed idea that describes how our universe formed. According to this theory, the entire universe began in a single instant, in an unimaginably powerful explosion. That explosion created all time and space, all matter and...

Carefully leveled text and fresh, vibrant photos engage young readers in learning about the changes and adaptations fall brings. Age-appropriate critical thinking questions and a photo glossary help build nonfiction learning skills.

Carefully leveled text and fresh, vibrant photos engage young readers in learning about warm, sunny season of summer and its changes and adaptations. Age-appropriate critical thinking questions and a photo glossary help build nonfiction learning skills.

Audisee® eBooks with Audio combine professional narration and text highlighting to engage reluctant readers! Did you know that light has energy? It helps us see in the dark, it brings color to our world, and it moves through the air faster than sound! With age-appropriate critical thinking questions and carefully leveled text, young readers will learn all about light while building nonfiction reading skills.

"How does a cake bake? What's the difference between baking soda and baking powder? And why is it so important to measure the different ingredients in a recipe?"--Amazon.

COVID-19 has shut down most people's normal lives. But grocery stores are still open, mail is still delivered, and restaurants are offering meals via delivery. None of this would be possible without the people who are still going to work every day, exposing themselves to the virus so that others can stay home. Most importantly, healthcare workers are doing all they can-putting their own lives at risk-to treat and save those who have contracted the...

Carefully leveled text and fresh, vibrant photos engage young readers in learning about rays. Age-appropriate critical thinking questions and a photo glossary help build nonfiction learning skills.

Audisee® eBooks with Audio combine professional narration and text highlighting to engage reluctant readers! Carefully leveled text and fresh, vibrant photos engage young readers in learning about sharks. Age-appropriate critical thinking questions and a photo glossary help build nonfiction learning skills.

"A must for fans of science and history-and also armchair detectives-this entertaining and informative illustrated compendium delves into nature's deadliest plants and their fascinating histories as implements of medicine, warfare, and foul play"-- Provided by publisher.

A lo largo de los años, la gente ha buscado formas de mejorar nuestra visión imperfecta. Esto nos ha llevado al mundo de la óptica, que es el estudio de la luz y cómo viaja. ¿Cuáles son algunas de estas innovaciones que han cambiado la forma en que vemos el mundo y cómo funcionan? ¡Encuentre las respuestas a estas preguntas con este texto informativo del Smithsonian! Creado en colaboración con la Institución Smithsonian, este texto desarrolla...