Forty years ago, Bruce and Liz MacDonald along with their young son, Jeff, set off in a 31-foot boat on what would become a three-year circumnavigation of the world. The idea for the voyage was born in 1971 when they had no jobs, very little money, and had never even sailed. Against all reason, they laid out a five-year plan that would, they hoped, put them in a position to make their dream a reality. Incredibly, it all worked out almost exactly as...