Once we bowled in leagues, usually after work; but no longer. This seemingly small phenomenon symbolizes a significant social change. Drawing on surveys on Americans' changing behavior over the past twenty-five years, Putnam shows how we have become increasingly disconnected from family, friends, neighbors, and social structures, whether the PTA, church, recreation clubs, political parties, or bowling leagues. Our shrinking access to the "social capital" that is the reward of communal activity and community sharing is a serious threat to our civic and personal health. The loss of social capital is felt in critical ways : communities with less social capital have lower educational performance and more teen pregnancy, child suicide, low birth weight, and prenatal mortality. Social capital is also a strong predictor of crime rates, other measures of neighborhood quality of life, and health. America has faced this crisis before. At the turn of the last century, social capital was at low ebb, reduced by urbanization, industrialization, and vast immigration that uprooted Americans from their friends, social institutions, and families. Faced with this challenge, the country righted itself. Within a few decades, a range of organizations was created, from the Red Cross, Boy Scouts, and YWCA to Hadassah and the Knights of Columbus and the Urban League and social capital was rebuilt. Putnam calls on Americans to start the process again.