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ST. PETERSBURG, Fla. — 1000 years ago, people carried shells here – adding them to an already massive mound that's 900 feet long, 300 feet wide, and 23 feet above the average high tide.
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Oyster shells are bulky and plain, but the treasures they hold go beyond their tasty meat and beautiful pearls. One company in Hong Kong is turning them into materials for constructing buildings.
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