What makes the heart beat faster or slower? How do tightrope walkers keep their balance? Why does spinning fast cause dizziness? Explore the mysteries and the w

Presents simple experiments answering such questions about the human body as "Why does my skin pucker up when I take a long bath?" "Why are my bones hard?" and

Why do planets spin? How hot is the Sun? What keeps the Moon in orbit around the Earth? What are Saturn's rings made of? What's a black hole in space? Now you c

How do plants make their own food? Why do the different strings on a guitar have differentsounds? What does the color of a star tell you about how hot the stari

Why is the ocean salty? How do whales stay warm? What causes tides to rise and fall? How do oil spills affect ocean animals? Now you can discover the answers to