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

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The author's hands-on science books for kids ages 8 through 12 have set a new standard in science activity books. Children, parents, and teachers have come to l

How are mountains formed? What makes the air we breathe? What causes the ocean waves? Now you can learn the answers to these and other questions aboutthe earth,