La Misión de Santa Inés (Discovering Mission Santa Inés)

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.

Cuarto y último de la nueva edición íntegra, en cuatro volúmenes, de este gran clásico de la historiografía concebido según los cánones del espíritu de la Ilustración. Publicada por vez primera entre 1776 y 1787, esta historia de la decadencia y ruina del Imperio Romano obtuvo el inmediato reconocimiento académico y el favor de los lectores, motivando su continua reedición.

Rainforests play an important role in the health of the world. Plants, animals, and people all depend on rainforests for many reasons. A tropical rainforest is filled with wonder and mystery, from the tallest trees in the canopy to the darkest and wettest leaves on the forest floor. The animals that inhabit this biome are varied and exotic. What readers may not realize is that not all rainforests mark the areas around the equator. Temperate rainforests, with milder climates, extend toward the poles. Readers learn the similarities and differences between these two biomes.

Discover 25 women who were trailblazers in science, technology, architecture, engineering, and more. Learn about some of the women who defied expectations and introduced the world to new ideas and creations big and small. Fully translated Spanish text.