this is about one hour. >> mei fong, welcome to "after words". you just published your first book. it's a remarkable book. i enjoyed it immensely. it's the subject of a lot of discussion. the book is called "one child: the story of china's most radical experiment". in a minute we will talk about why you chose this subject and how you went about answering the questions on your mind. first i think it would be helpful to define for people what it is we are actually talking about. what is china's one child policy? >> evan, the the one child policy is really a bit of in misnomer. it's a name we used to describe a set of rules that china has used to regulate the population. theoretically, you could lightly call at 1.5 child five child for a long time. now they have moved it to a two child policy, but it's laws and regulations. >> it's not one law, but a basket of policies. >> that's right. >> when did it happen? when did it go into effect question. >> some people counted as 1979, others counted as 1980. i call counted as 1980 when the communist party put out a letter saying saying we are