Nothing captures the exuberance of Expo '67 better than the geodesic dome designed by Buckminster Fuller (1895-1983) as the American Pavilion. It's only a skeleton now -- the polymer panels that protected the U.S. exhibits from the elements were burned out in a fire long ago -- but it's still an eye-catching sight, like something plucked from a science-fiction film. There's nothing particularly fanciful about the environmental center the federal government has built in the middle of the dome, however. Its purpose is to heighten awareness of the problems faced by the St. Lawrence River system, whose water levels have dropped dramatically in recent decades. But despite its earnestness, the museum manages to make the whole thing fun. Visitors of all ages -- especially kids -- can use games and interactive displays arranged around a large model of the waterway to explore how shipping, tourism, water supplies, and hydroelectric power are affected.
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