Tom Szaky's company, TerraCycle, makes products from garbage and expects to bring in $15 million this year. He's not aiming for the Whole Foods crowd. His stuff -- reusable totes made from plastic bags, pencil cases from juice boxes, fertilizer from worm poop -- is on the shelves at Home Depot, Target and Wal-Mart. "The most important innovation is looking at things people don't value as a fundamental building block. It's not just physical garbage -- it could be people, ideas or objects."

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