About 85 percent of the brain is developed by age 3. And while many children are fortunate enough to be born into loving, financially secure households, about 72 percent of Luzerne County children are born into economically at-risk households, and a significant number of those children also are born to young single mothers with less than a high school education. http://timesleader.com/opinion/columns/545557/phyllis-mundy-boost-funding-for-home-visiting-programs-that-benefit-preschoolers