I'll never forget, I remember vividly to this day, our first son, Declan, was nine months old, and I was sitting there on the couch, and I was reading Daniel Gilbert's wonderful book, "" Stumbling on Happiness. "" And I got about two-thirds of the way through, and there was a chart on the right-hand side — on the right-hand page — that we've labeled here "" The Most Terrifying Chart Imaginable for a New Parent. "" This chart is comprised of four completely independent studies.