. >> yes, it is marin to the north, san mateo to the south, we go from men low park to nova doe. and it true to say -- i know it is true to say a majority of the catholics are outside of the city of san francisco. >> the urban areas, are matched by rural areas, you have areas like rio honda, so there is a real range when you talk about diversity, there is diversity in the kinds of communities people live in. >> the last thing people would expect visiting san francisco is looking at little frame wooden churches but we have three or four of them that is again diversity of situations of worship. the sites where people worship, styles they may worship. resources they may have. it is much easier to get musicians at the cathedral than some tiny little village church. >> usually the orchestra are trying to achieve the mission of the local church, proclaim the gospel of jesus christ it is a challenge every day that you come to work i imagine. >> it is but again, i would stress the gratitude yes, the challenge is there we all know it and face it and deal with it but it is the dealing with

sort of thing when you're trying to conduct a primetime series like the whun you're behind with "nova" that does have as its audience everyone from 8 to 80. how do you go about putting together a show that does in fact keep the interest and that can be understood by and can inspire people in that broad age range? >> yeah, you said it. it was a very fine line. you want to teach the science, but you don't want to bore people. so what the producers decided to do at "nova" was to make it experiential. they wanted to immerse me in the most visual possible way to report these stories. so i mean, during this year and a half we filmed the thing, i swam with shashes, landed on an aircraft carrier, went hang gliding, fired an ak-47, had my blood drawn, got an m.r.i., worked with a beehive. i wasn't sure if they were trying to film me or kill me but it was very exciting and makes for very, very visual television. that's a big part of it. also, they have the most incredible computer generated graphics to illustrate these points. behind the scenes, what materials is are is molecules and atoms. on a tiny, tin