" After more than a thousand of these buzz-report-introspect-text moments, Graham looked over the data and found that couples who routinely performed difficult tasks together as partners were also more likely to like each other. Over the course of his experiments, he found that partners tended to feel closer, more attracted to, and more in love with each other when their skills were routinely challenged. "

― David McRaney , You Are Now Less Dumb: How to Conquer Mob Mentality, How to Buy Happiness, and All the Other Ways to Outsmart Yourself