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Starting in September, 80 primary schools around the world operated by the Department of Defense Education Activity will have universal pre-K for 4-year-olds. Shown here, pre-K students play at M.C.

A little more than a decade ago, Bill de Blasio, then the New York City public advocate preparing a run for mayor, sat at a window table in Bar Toto in Park Slope with his policy adviser Ursulina ...