some of s caorotle like mi t we really need to make this effective, safe, and stable. so that has happened, if i am not wrong. what you teach is genuine science and genuine biology. >> yes. i think with our background in technology and science, i didn't believe in it to be honest. i didn't think it was going to work. every time i heard someone used natural family planning, they had a ton of kids. at that time i didn't understand. i thought oh it must be because the method doesn't work, not because they wanted so many kids. i think as we started learning about it, i was fascinated by how our bodies work and how effective it is. >> that is interesting. let me ask you this. you volunteered as teachers. where do you teach and for whom do you teach? >> we have been helping different diocese, mainly san francisco and oakland. we are also in santa rosa doing classes. we can be in contact for different parishes. we do introductory classes to explain the method. it is not really to learn it. it is to inform people about it. then we do the class. >> i think most catholic diocese