Google had an M&M problem. Employees were eating too much of the free candy placed in bowls around the office. So Google put engineers and behavioral psychologists on the problem. “What if the company kept the chocolates hidden in opaque containers but prominently displayed dried figs, pistachios and other healthful snacks in glass jars?” It turned out that employees consumed 3.1 million fewer M&M calories over a period of just seven weeks. Sounds like a good opportunity for Facebook and Apple to offer all the M&Ms you can eat, no judgment, no questions asked.