Students participate in orchestra practice at Dr. John Folks Middle School in suburban San Antonio. The school is brand new and was built with explosive growth in mind — the student population is expected to double to 1,200 within five years. Melissa Block/NPR hide caption

itoggle caption Melissa Block/NPR

Soldiers participate in physical therapy while using a prosthetic brace called the Intrepid Dynamic Exoskeletal Orthosis (IDEO), which allows them to use and strengthen severely injured legs. John Moore/Getty Images hide caption

itoggle caption John Moore/Getty Images