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2000. Which tree was used by the ancient Greeks to treat asthma and coughs? Why do leaves turn orange and gold duing autumn? How do trees defend their neighbors against predators in the forest? when is a tree not a tree? Trees, an Explore Your World™ handbook, incorporates the Discovery Channel's unique authoritative approach and acclaimed visuals to answer these and other questions in a captivating blend of information and entertainment. 192 pages, soft cover.