The capacity to be alone--properly alone--is one of life's subtlest skills. Real solitude is a contented and productive state that garners tangible rewards: it allows us to reflect and recharge, improving our relationships with ourselves and, paradoxically, with others. Today, the zeitgeist embraces sharing like never before. Fueled by our dependence on online and social media, we have created an ecosystem of obsessive distraction that dangerously undervalues solitude. Many of us now lead lives of strangely crowded loneliness--we are ever-connected, but only shallowly so.