Students at Appalachian State University in Boone, N.C. spent a recent Saturday volunteering with Appalachian Voices and others to give two local homes an energy efficiency boost. The work was part of the school’s 18th annual MLK Challenge. “They caught energy leaks I knew nothing about,” said Faith Wright of Vilas, N.C., who was grateful for the volunteer energy of what she called the “student worker bees.”