samuel: potassium permanganate is toxic. reporter: this is no ordinary class.hese 10th grade students are between 20 and 50 years old. all of them are here to get their high school diplomas. milicent yewa is close to reaching her goal. she's been going to school every weekday for nearly two years. the mother of two wants to be a good role model for her children. milicent: we have a story to tell. we went to our children. and when we come back to school, then the children get motivated, and you have a reason to tell them, , you have to o read and t be like me. do it now when you have the time. reporter: the teacher, samuel maina, often feels like a child himself. most of his students are older than he is. he aims to maintain a friendly rapport with the members of his class. he knows that many of them have a lot more than school to cope with. samuel: it is harder because you realize when you are old you have responsibilities, your family, you have business, your mind is scattered, and it is not as easy as when a person is young. reporter: milicent yewa can relate