Then one day it was different. In the summer of 1999, my wife Shawn and I spent two months with our three young sons at a retreat center nestled in the arid foothills bordering Simi Valley, California. The campus was a spectacular, sprawling property stretching over gentle, golden ridges dotted with eucalyptus, pepper trees, and cactus. Shawn, a recently ordained rabbi, was teaching Jewish texts and practices to a group of young adults. The job required long hours not only in the classroom but also in intense, private discussions of spirituality during meals in the dining hall, on long strolls, and over snacks late into the night. At the same time she was nurturing the souls of a few dozen twenty-somethings, we were also busy caring for our boys: Ami, who was five; Ezra, three; and Noam, eighteen months. Some months earlier, Ezra had begun displaying troubling behavior. He isolated himself from his preschool classmates to flip mechanically through picture books. At home, he spent inordinate periods absorbed in solitary, odd activities like lining up plastic dinosaurs and jungle animals in precise, symmetrical patterns across the back porch.