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Chameleons
These lizards are amazing quick-change artists. How do they and other animals change color—and why?


	BIG HAIRY DEAL It can be long or short, curly or straight. It may be black, yellow, brown, or red. For some, it's a canvas for self-expression. For others, it's a hassle. It's hair, and all mammals have it—including you. But where does it come from? And why do we have it? Find out on page 10 of our October issue. Explore More Jess M. Brallier, Hairy Science (Planet Dexter, 2001) Richard Corson, Fashions in Hair: The First Five Thousand Years (Peter Owen, 2001) Anne Akers Johnson, Hair: A Book of Braiding and Styles (Klutz, 1995) >> Quick Flicks: Hair Why do we have hair? How does it grow? Get the answers in this cartoon. >> Exploratorium: Better Hair Through Chemistry A bad-hair day can be a drag. But it can also be a way to learn some science. >> A Brief History of Hairstyles Think rock stars invented weird hairdos? Think again. Ancient Egyptians wore green wigs. And French nobles colored their hair pink.


	CHINA'S GREAT WALL The Great Wall winds across northern China like a huge stone dragon. For centuries its job was to protect China from northern invaders. Today the wall has a new role as a symbol of China's long history. It also has big problems. Time, wind, and armies of tourists have damaged the centuries-old structure. Can China protect the Great Wall that once protected China? Scale the wall on page 18 of our October issue. Explore More Elizabeth Mann, The Great Wall (Mikaya, 1997) Arthur Waldron, The Great Wall of China: From History to Myth (Cambridge University, 1990). Kevin Supples, China (National Geographic Reading Expeditions, 2002) >> Secrets of the Great Wall Three-dimensional pictures take you atop the Great Wall and into a watch tower. A time line gives you an overview of the wall's history. >> World Monuments Fund Learn more about the threats to the Great Wall and other historic sites. >> Gallery: The Great Wall Look at the wall from all angles. Check out these 20 photos from the China National Tourism Administration.