Maine Governor Janet Mills signed into law last week a bill that would require companies to stop giving out cups and other single-use containers made of polystyrene foam, commonly known as Styrofoam, by January 2021. Joining *Boston Public Radio *to weigh in was Corby Kummer, a senior editor at The Atlantic, an award-winning food writer, and a senior lecturer at the Tufts Friedman School of Nutrition and Policy.