Book excerpt: "In The Explorers, New York Times bestselling author Martin Dugard shares the rich saga of the Burton and Speke expedition. To better understand their motivations and ultimate success, Dugard guides readers through the seven vital traits that Burton and Speke, as well as many of history's legendary explorers, called upon to see their impossible journeys through to the end: curiosity, hope, passion, courage, independence, self-discipline, and perseverance."--www.Amazon.com.