The orchids that produce vanilla beans have no natural pollinators in Madagascar; the plant must be pollinated by hand — a labor-intensive process with little margin for error. Courtesy of Madécasse hide caption

itoggle caption Courtesy of Madécasse

Hannah Marqusee taught these Nepali 8th- and 9th-graders to play Ultimate Frisbee. "Despite being terrible at throwing, they had a really good time," she reports. Their verdict: slightly more fun than soccer but not quite as fun as cricket. Bottom row, fourth from the right, is her host brother, Sachin. Courtesy of Hannah Marqusee hide caption

itoggle caption Courtesy of Hannah Marqusee