I invite you to picture in your mind a classic late 20th century office complex; a big room with fluorescent lights, rows of square cubicles and stale air; the smell of weak coffee in styrofoam cups and the soft buzzing whirl of hard drives and printers; offgasing gray-blue carpets and upholstered chairs on plastic wheels. Mixed in with all this sensory input—the ubiquitous jar of M&Ms. This M&M jar would just sit there, hour upon hour, calling on people to have one; daring them not to overindulge. A few workers would proudly resist, but for most, the pull was too strong and the jar would be empty by the end of the day. Why were those M&M’s so…