In the summer of 1997 renowned nature photographer C. C. Lockwood embarked on a remarkable adventure. First by canoe and then by Grand Canyon-style pontoon raft, he journeyed the length of the Mississippi River--2,320 miles--from its source at Lake Itasca, Minnesota, to its mouth at the Gulf of Mexico. Armed with his camera and computer equipment to transmit stories and pictures to schoolchildren, this "High Tech Huck Finn" trained his lens on...