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Re:Preschool can provide a boost, but the gains can fade sur... by Animats on Friday February 17, 2017 @09:40PM (#13673325)
That's known to be true of Head Start.[1]

[1] http://www.edweek.org/ew/articles/2010/01/20/18report-b1.h29...

Re:Preschool can provide a boost, but the gains can fade sur... by contravariant on Friday February 17, 2017 @10:28PM (#13673454)
They mention this in the article.