Whenever Elizabeth Sheehan drives into Boston, she makes a mental note of how many shipping containers she spots near the harbor. “There’s a wall of them, and some haven’t moved in months,” says the Massachusetts resident. If Sheehan gets her way, many of these surplus metal boxes will soon be transformed into clean, efficient health care centers outfitted to serve the most vulnerable people throughout the Caribbean, Africa, and Southeast Asia. That’s the idea behin…

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