Un polizón en la maleta

What causes sound? How does sound travel? Sound begins when matter vibrates. Without this vibration sound could not move and nothing would make any noise. Starting with tiny molecules, this book explains the main concepts of sound and furthers understanding through a series of easy-to-do experiments that will appeal to readers of all ages.

In what ways are the branches of government like a basketball game? How can a school yard game's rules liken themselves to a constitution? Through engaging analogies and introductions, our new Spanish-language government series gets English language learners ready for election 2008. Correlated to the fourth and fifth grade social studies curriculum, My American Government introduces students to how our government works. Students learn about the U.S. Constitution, the branches of government, citizens' basic rights, and how we elect our leaders.

Todos conocemos la obra de Vincet Van Gogh, pero ¿Sabes cómo fue que se inició en el arte? En una pequeña ciudad en Holanda vive el travieso Vincent Van Gogh, un pelirrojo con las mejillas llenas de pecas al que le encanta meterse en problemas. Junto a su inseparable hermano Theo, pasa sus tardes buscando nidos y mirando las estrellas, descubriendo una manera de ver el mundo que hoy puedes encontrar en pinturas colgadas en museos de muchos países. Aquí conocerás cómo fue la niñez de este famoso pintor impresionista y cómo inició su camino para convertirse en uno de los artistas...

In My Friend Has Autism, beginning readers are introduced to different characters who have autism, how autism may affect their actions, and how we can be good friends to people who have autism. Vibrant, full-color photos and carefully leveled text engage young readers as they discover how to empathetic and inlude all kinds of friends.