Today marks the 50th anniversary of the Salk polio vaccine. Poliomyelitis, also know as infantile paralysis, used to be one of childhood's most feared diseases. A few years after Dr. Jonas Salk announced his vaccine on April 12, 1955, nearly every child in the U.S. was protected. Today polio has disappeared from the Americas, Europe and the Western Pacific.... A too-little known part of this feat is the role played by Rotary, the international businessman's club, which 20 years ago adopted the goal of wiping out the disease. Rotary understood that medical breakthroughs are worthless unless people aren't afraid to...