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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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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California state Sen. Mark Leno sponsored a bill to require schools to offer free drinking water to students. Rich Pedroncelli/AP hide caption

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Prescription drug use is up in the last 10 years, with about 48 percent of Americans now taking at least one medicine. Greg Martin/ hide caption

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