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Mysteries of the Great Lakes 

A new IMAX film examines both pollution and progress

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The point of this film is actually no mystery: The five lakes that contain nearly one-fifth of the earth's fresh water have been "systematically ravaged" by pollution and overfishing. The film is structured around efforts to save the lake sturgeon, a 150 million-year-old species driven to the edge of extinction by a single century of human industry. In 45 minutes, we learn of Lake Erie's near-death experience (and partial recovery); how man-made toxins poison wildlife; and the trouble caused by raw sewage discharges. By-the-ways like eerie underwater footage of shipwrecks, and a shoehorned-in plug for hydroelectric power (the film is sponsored by globocorp Unilever) round things out. But the most memorable sight remains that of the sturgeons themselves. These fish can attain lengths of 7 feet, and on the giant domed screen they surge past at 10 times life-size. Carnegie Science Center

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