Dalma Cartagena teaches a class on agricultural science to elementary-school students in Orocovis, Puerto Rico. "I'm preparing them to make good decisions when it comes to the environment and healthy foods," she says. Greg Allen/NPR hide caption

itoggle caption Greg Allen/NPR

A pedestrian walks by a Panera Bread restaurant on June 3 in San Francisco, Calif. Panera Bread is set to remove all artificial colors, flavors, sweeteners and preservatives from its from items on its menu by the end of 2016. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images

Now that's a big root: Sweet potatoes aren't tubers, or thickened stems, like potatoes. Sweet potatoes are roots — swollen and packed with starch. U-ichiro Murakami/Flickr.com hide caption

itoggle caption U-ichiro Murakami/Flickr.com

Author Barry Estabrook says pigs can be taught to play computer games and recognize themselves in a mirror. W. W. Norton & Company hide caption

itoggle caption W. W. Norton & Company

Under a new global structure, McDonald's is grouping markets in Germany where a new McDonald's Flagship Restaurant opened in March, with other high-performing countries such as Australia and Canada. Hannelore Foerster/Getty Images hide caption

itoggle caption Hannelore Foerster/Getty Images

Once the roots of the Eskimo potato got too tough to eat, Christopher McCandless started collecting the seeds in a plastic bag, says author Jon Krakauer. Photo courtesy of McCandless family hide caption

itoggle caption Photo courtesy of McCandless family

A view inside the Kern's Kitchen factory in Louisville, Ky. Though lots of people in Kentucky have their own versions of what they call "derby pie," the Kern family trademarked the name "Derby-Pie" decades ago. And the Kerns are quite vigilant about protecting that brand name. Nina Feldman for NPR hide caption

itoggle caption Nina Feldman for NPR

Back in 2012, Silver Diner — a fast-casual restaurant chain in Maryland and Virginia — completely overhauled its children's menu. Those changes helped dramatically improve the healthfulness of kids' meals ordered, a new study finds. Ron Cogswell/Flickr hide caption

itoggle caption Ron Cogswell/Flickr

In the Blue Zone of Okinawa, Japan, locals drink green tea with jasmine flowers and turmeric called shan-pien, which translates to "tea with a bit of scent." David McLain/Courtesy of Blue Zones hide caption

itoggle caption David McLain/Courtesy of Blue Zones