SinkSkim like a concrete canoe. Building a concrete canoe (or its cousin, the cardboard canoe) takes creativity and know-how. The first was made in 1848, they're now computer-designed, light-weight marvels that move through the water as well as any fiberglass or wooden craft. Concrete canoe building is a competitive sport in many university civil engineering departments (Clemson won this year's competition.) Design your own, and enjoy paddling around in a nearby stream, lake or river.
December 4, 2002 9:18 AM Subscribe
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