Candy may well have its origins in medicine (think peppermint sticks), and many Americans still think of candy as an edible salve with which to cure and to celebrate. Today, Americans consume more than 600 billion pounds of the sugary stuff each year. Most Americans have their favorites, their go-to candy bars that bring them comfort. And most of us yearn for the candy of our youth, those treats that made us feel better no matter the occasion. From classics such as the Hershey bar and M&Ms to trend-setters like PEZ and Atomic Fireballs, candy has a special place in our hearts and memories....