How Much Can Human Life Span Be Extended? -- Couzin 309 (5731): 83 -- Science: "Just 2 or 3 decades ago, research on aging was a backwater. But when molecular biologists began hunting for ways to prolong life, they found that life span was remarkably pliable. Reducing the activity of an insulinlike receptor more than doubles the life span of worms to a startling--for them--6 weeks. Put certain strains of mice on near-starvation but nutrient-rich diets, and they live 50% longer than normal."