Johnson & Johnson CEO William Weldon (left) and Colleen Goggins, chairman of the company's consumer unit, (right) testify at a House Oversight and Government Reform Committee hearing Thursday. Mark Wilson/Getty Images hide caption

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California Gov. Arnold Schwarzenegger OKed a bill that requires school districts to offer students free water. Paul Sakuma/AP hide caption

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Jason Middlebrook's Traveling Seeds can be found on the walls of Mount Sinai Hospital's Bone Marrow Transplant Unit in New York. Courtesy of Rx Art hide caption

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Geochemist Gabriel Filippelli in an Indianapolis garden. Filippelli's research shows that many urban gardens may have soil contaminated with lead Courtesy of Gabriel Filippelli hide caption

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