Peppers for sale at what locals are calling the White House Farmers Market, in Washington, D.C. Matt Sennewald/NPR hide caption

itoggle caption Matt Sennewald/NPR

San Juan Bioenergy is converting sunflower waste — including hulls and other plant material — into fuel pellets that produce a portion of the power used by the extraction facility. Adam Burke for NPR hide caption

itoggle caption Adam Burke for NPR

A jogger runs near downtown Houston. Recent studies show that running doesn't increase the risk of arthritis, and some runner's actually have healthier joints. David J. Phillip/AP hide caption

itoggle caption David J. Phillip/AP