that word around the way politicians throw out promises during election season. In any given week, we read about assorted heartaches on Facebook. We drink coffee with a friend who has a heavy heart. We lament the relational woes of the neighbors: She loves him with all her heart, but he’s cold-hearted toward her. The heart is a staple of our music: How can you mend a broken heart? the Bee Gees mourned even as the great Tony Bennett crooned about how he left his heart in San Francisco. (Maybe that’s