Ten Massachusetts public schools that last year lengthened the school day by 25% or more to offer extra reading, writing and math lessons saw student scores increase across the board. Education leaders across the U.S. are weighing whether they should follow suit, and U.S. Sen. Edward Kennedy, D-Mass., wants Congress to approve legislation to make school days longer. Massachusetts spent about $20 million administering the program, at a cost of $1,300 per student.

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