Popular Science strongly stands behind Zuck's advice, and continues to better their communities and the world, from the nine-year-old who wants to stop Ebola to the 17-year-old who invented a "smart-cane" to help her grandmother walk. We also share the stories of those children giving back, like Hailey Fort, who builds hones gor the homeless. We salute those young people working towards a brighter future for humanity.