"When John Wesley Powell became the first person to navigate the entire Colorado River, through the Grand Canyon, he completed what Lewis and Clark had begun nearly 70 years earlier--the final exploration of continental America. The son of an abolitionist preacher, a Civil War hero (who lost an arm at Shiloh), and a passionate naturalist and geologist, in 1869 Powell tackled the vast and dangerous gorge carved by the Colorado River and known today...

This book is about one of the most enduring and vitriolic feuds in the history of exploration. "What a consummate cur he is, '" said Robert Peary of Frederick Cook in 1911. Cook responded, "Peary has stooped to every crime from rape to murder." They had started out as friends and shipmates, with Cook, a doctor, accompanying Peary, a civil engineer, on an expedition to northern Greenland in 1891. Peary's leg was shattered in an accident, and without...