These thin, flexible sheets shrink into hard plastic when baked. First sold in a Brookfield, Wis., shopping mall in 1973, Shrinky Dinks were almost magical. After decorating the thin piece of plastic and baking it, kids could watch their creation shrink to one-third its size and become about nine times thicker. Invented by Betty Morris and Kathryn Bloomberg as a Boy Scouts project with their sons, Shrinky Dinks went on to be manufactured by a few major toy companies before hitting their popularity apex in the mid-1980s.
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