To the more than 6,500 young people who visit Thompson Island each year, the trip to the 24-acre islet 2 miles into Boston Harbor might as well be a journey to a faraway hinterland. It was disheartening two years ago when school principals around Boston told the organization that owns and runs the island that they couldn’t afford to send their students there during school days because the experience wasn’t helping students improve their MCAS scores.
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