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

itoggle caption Paul Sakuma/AP

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

itoggle caption Courtesy of Gabriel Filippelli

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

itoggle caption Rich Pedroncelli/AP

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

itoggle caption Greg Martin/