Thirty years ago, "mindfulness" was a Buddhist principle mostly obscure to the west. Today, it is a popular cure-all for Americans' daily problems. A massive and lucrative industry promotes mindfulness in every aspect of life, however mundane or unlikely: Americans of various faiths (or none at all) practice mindful eating, mindful sex, mindful parenting, mindfulness in the office, mindful sports, mindfulness-based stress relief and addiction recovery,...