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Katydid: Mark Moffett/Minden Pictures

Roller coaster: Shutterstock

Sandstone: Jeremy Woodhouse/Pixelchrome, Inc.

Cave painting: �
Owaki-Kulla/ Corbis

Bug Battles
Explore the many ways that mantids and katydids play it safe.


	GRAVITY RULES Faster, taller roller coasters are pushing riders to new limits. How? They're putting stronger and stronger g-forces on passengers. As g-forces increase, so does the pressure that gravity puts on the human body. The stronger the g-force, the more likely riders are to get hurt. Learn what's being donE to keep super coasters both fun and safe. Race into roller coasters on page 2 of our May 2006 issue. Explore More Roller Coaster DataBase Discover the fastest, tallest, and longest roller coasters in the world. Learner.org: Amusment Park Physics Learn how your favorite amusement park rides turn physics into fun. How Things Work A physicist answers questions about the science of everyday objects, from wheels and ramps to nuclear reactors.


	ROCK HOUND Rocks tell Earth's story. There are three main types of rock: igneous, sedimentary, and metamorphic. Each type forms in a different way. By studying rocks, scientists can tell how a piece of land has changed over thousands of years. Uncover rocks and the stories they tell on page 6 of our May 2006 issue. Explore More Mineralogy 4 Kids Learn about rocks, minerals, and crystals. NG Game: Rock Stars Are you a rock star? Play our game and find out. NG Quick Flick: Rock Cycle Discover how rocks form with Tim and his robot, Moby.


	ANCIENT ART From Africa to Europe to a remote island in the Pacific Ocean, archaeologists have found many ancient works of art. They help archaeologists learn about life in the past. It helps them understand the way people lived thousands of years ago. Travel the world, exploring works of ancient art, on page 18 of our May 2006 issue. Explore More The Cave of Lascaux Visit the site of the world's most famous prehistoric paintings. PBS Nova: Secrets of Easter Island Learn how scientists tried to solve the mystery of Easter Island's giant statues. Stone Pages See pictures of ancient art in England, Ireland, and France.