Sometimes, the simplest ideas turn out to be the hardest. That was the case at Dunkin' Donuts, where the company wanted to eliminate its Styrofoam cups and replace them with something more environmentally friendly. They thought it would be easy -- but the change took 10 years, countless prototyes, meetings with competitors, and a deep study of how people hold cups. This is the inside story of that quest, and how Dunkin' finally got it right.

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