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Pondering The Popularity Of The Pet Rock — And Other Fads

Pet Rock creator Gary Ross Dahl became a millionaire from his rock sales in the 1970s. Each rock came in a special box (bottom left) with a detailed instruction manual. (AP)
Pet Rock creator Gary Ross Dahl became a millionaire from his rock sales in the 1970s. Each rock came in a special box (bottom left) with a detailed instruction manual. (AP)

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