| http://www.w3.org/ns/prov#value | - The correlations at times seemed almost comically exact: Hart and Risley calculated that a child who grew up on welfare would need precisely forty-one hours of language-intensive intervention each week in order to close the vocabulary gap with a working-class child.But in the past decade, and especially in the past few years, a disparate congregation of economists, educators, psychologists, and ne
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