The federal government spends almost $8 billion on preschool programs across the country, mostly on low income 4-year-olds. States spend billions more. But with at least 30 states planning to expand access to pre-K and President Obama promoting "preschool for all," what constitutes a quality preschool program?
NPR's education team set out to better understand what separates the nation's best programs from the rest, and that journey led to a surprising place: Tulsa, Okla. .
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