by: Joseph Harris There is a concept in the world of longevity research called a Blue Zone. The term came from a simple act — two scientists in 1999, mapping the villages in the mountainous Ogliastra province of Sardinia where men routinely lived past a hundred, drawing circles on the map in blue marker wherever the centenarians clustered. The blue circles gave the phenomenon its name. Dan Buettner later expanded the research globally and identified five places on earth where