This morning I set out to find how mattresses were recycled, and here's what I learned. Lowell, Lawrence, and Haverhill are medium-sized Massachusetts cities with three things in common: "High poverty rates, low educational attainment levels, and a strong manufacturing heritage." The three cities also have 25 separate criminal gangs among them. It might not be obvious how you could combine those elements to effect societal change and help the environment. But Greg Croteau and UTEC, the...

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