Atak Natali and Divine Macibiri, students at Lyman Moore Middle School in Portland, are known in their large families as problem solvers. That was even before they organized a cleanup event at the Front Street neighborhood playgrounds and secured a grant to repaint and repair the equipment there. “When there’s something wrong in the house, I’m always up to making it resolved,” Atak said with a self-assuredness that’s rare in a 13-year-old.