After the devastating rebel invasion of Freetown in 1999 and the Ebola epidemic in 2014, Yvonne Aki-Sawyerr, mayor of the city, refused to be paralyzed by her frustration with the status quo. Instead, she used her anger as a catalyst for action. In this inspiring talk, she shares how she transformed her city by taking the risks necessary to bring about dramatic change -- and shows how you can find power in your dissatisfaction.