Explains how bacteria and viruses affect the human body and how the body fights them.

Explains why oil spills occur and how they are cleaned up and suggests strategies for preventing them in the future. Did you know that an oil spill occurs somewhere in the world almost every day of the year? Berger and Mirocha focus on one of the worst spills in history-the 1989 Exxon Valdez oil tanker spill-to explain in simple terms and with bold, full color illustrations why oils spills happen, how experts clean up after them, and what effect spilled...

Explains the concept of a food chain and how plants, animals, and humans are ecologically linked.

Explores the mysteries of bird migration, including theories on how birds find their way and how scientists learn about migration.

Explains how the water cycle leads to different types of weather patterns.

Examines life aboard a space shuttle, describing how astronauts deal with weightlessness, how they eat and exercise, some of the work they do, and more.

An introduction to reflex acts that explains why we sneeze, shiver, hiccup, and yawn.

Describes the characteristics of spiders and the methods they use to trap their prey in webs.

Explains how earthworms eat, move, and reproduce and how they help plants to grow.