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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.

Los jovenes lectores se transportan dentro de un laberinto de un castillo antiguo directamente al corazon de una batalla con un malvado senor feudal y para cumplir la mision hay que encontrar la salida y descifrar el mensaje oculto. Estas aventuras sirven tambien como lecciones acerca de culturas y actividades del pasado, el presente, y el futuro.

Ya sabemos quienes son los One Direction. Pero ¿quién es cada uno de ellos? Con estos títulos, uno para cada uno de los integrantes de la banda británica más caliente del momento, aprenderás todo lo que tienes que saber sobre Harry, Louis, Niall, Zayn y L

Computer science is all around us, at school, at home, and in the community. Anyone can learn computer science, even at the elementary school level. This book delves into essential computer science concepts using age-appropriate language and colorful images. The computer science topic is paired with an age-appropriate curricular topic to deepen readers' learning experience. The instructional guide on the inside front and back covers provides: Vocabulary, Background knowledge, Text-dependent questions, Whole class activities, and Independent activities.