Why do people raised in the same families often differ more dramatically in personality and temperament than those from different families? What made Charles Darwin, Benjamin Franklin, and Voltaire uniquely suited to challenge the conventional wisdom of their times? This book details a pioneering new theory of the significance of birth order that envisions the family as an ecosystem in which siblings compete for parental resources by occupying specific niches. A New York Times Notable Book. 140 photos, maps and graphs | Born To Rebel by Frank J. Sulloway, Paperback | Indigo Chapters