John Wesley Powell:
It was 1869. Ten men in four boats were about to embark on a journey that would cover almost 1,000 miles through uncharted canyons and change the west forever. Three months later only five of the original company plus their one-armed Civil War hero leader would emerge from the depths of the Grand Canyon at the mouth of the Virgin River.Thirty five-year-old Major John Wesley Powell was that expedition's leader. From early childhood Powell manifested deep interest in all natural phenomena. Original and self-reliant to a remarkable degree, he early undertook collecting and exploring trips quite unusual for a youth of his age, and studied botany, zoology, and geology wholly without the aid of a teacher.
Read: The Exploration Of The Colorado River and Its Canyons