In August 1998 Kim Trevathan summoned his beloved 45-pound German shepherd mix, Jasper, and paddled a canoe down the Tennessee River, an adventure chronicled in Paddling the Tennessee River: A Voyage on Easy Water. Twenty years later, in Against the Current: Paddling Upstream on the Tennessee River, he invites readers on a voyage of light-hearted rumination about time, memory, and change as he paddles the same river in the same boat--but...