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Thousands of plants and animals may become extinct every year, and scientists are scrambling to find and preserve what's left. Our guest has documented the effort from the mountains of Tasmania to the jungles of Brazil. Scott Weidensaul is the author of several books on natural history, including his latest, "The Ghost with Trembling Wings: Science, Wishful Thinking, and the Search for Lost Species." www.fsgbooks.com. Originally aired 11/25/2002