With deep courage, enormous strength and a set of keys, an uneducated woman named Mama Zula Karuhimbi, born in 1915, managed to save the lives of 100 people. She kept them hidden for 67 days during the 1994 ethnic genocide in Rwanda. She offered them shelter in her house in Gitarama, the country’s second-largest city, one of the places most affected by the horrible violence.