Huffington Post: Luisa Maria Vasquez Cruz received an unusual prescription last year from her pediatrician: Spend more time playing outside. Dr. Robert Zarr, her pediatrician at Unity Health Care, a clinic that serves low-income and uninsured families in Washington, D.C., calls her unconventional treatment regimen a "huge success." The 9-year-old's asthma is now well-controlled, and she is no longer obese -- conditions that prompted the prescription, he said. In Luisa's words, she feels "more energetic." As the...