In the final episode of our series about young people who are trying to solve global problems,we present Nimah Nawwab and Aaron Pereira. br br Aaron,from Canada,is a social entrepreneur -- but he wants to do even more. He hopes to convince people to see it as their personal duty to make the world a better place. br br Nimah is an artist from Saudi Arabia and an ardent campaigner for the rights of women and young people.