Why 3rd Grade Matters Well, many reasons. But Harvard economist Raj Chetty says that’s the age at which America’s “Einsteins” are identified — and lost. https://ift.tt/2XidLiy https://nyti.ms/3eyQv5F

Well, many reasons. But Harvard economist Raj Chetty says that’s the age at which America’s “Einsteins” are identified — and lost.

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