We offer a new analysis of a large-scale trial of an early-childhood education program that targeted premature, low-birthweight children. This targeting heavily oversampled twins, whose outcomes differed significantly from singletons'. Singletons' gains in short-term cognition and age-18...

We offer a new analysis of a large-scale trial of an early-childhood education program that targeted premature, low-birthweight children. This targeting heavily oversampled twins, whose outcomes differed significantly from singletons'. Singletons' gains in short-term cognition and age-18...

The Perry Preschool Project, the longest-running experimental study of an early childhood education program, demonstrates how such interventions can yield long-term personal, societal, and intergenerational benefits for disadvantaged populations. The evidence is clear: investments in...