We rely on science to tell us everything from what to eat to when and how long to exercise, but what about relationships? Is there a scientific explanation for why some people seem to navigate relationships effortlessly, while others struggle? According to psychiatrist and neuroscientist Dr. Amir Levine and Rachel Heller, the answer is a resounding "yes."

In Attached, Levine and Heller reveal how an understanding of adult attachment-the most advanced relationship science in existence today-can help us find and sustain love. Pioneered by psychologist John Bowlby in the 1950s, the...