Glebe Elementary School in Arlington, Virginia is simply a happy place. From my first step into the building, with its flamingo-pink walls and pet turtles (“please wash your hands after touching the turtles” suggested a sign in lobby), the school hummed with peaceful purpose. And the sense of focused calm went beyond the reason for my visit -- celebrating the installation of a small, educational solar array. Even after the outdoor assembly had concluded, I felt a coordinated commitment to making learning joyful.