, it's a grassroots kind of thing where you can advocate for what you want to do going on in the lunchroomthe classroom, and even in terms of snacks and other activities. >> we keep going back to that. we're told that it was the department of defense initially that started the school lunch program because so many of the recruits, quite frankly, were not up to snuff, you know? and now it's the reverse.

most fruit in school lunchrooms are sold in metal trays and inconvenient locations. for an entire semester the conducted an experiment. when they compared sales from the previous year, they noticed skills skyrocketed by more than 100%. tonight researchers at children's hospital of philadelphia are closer to discovering a genetic cause to type 1 diabetes. they analyze the genes of 10,000 patients and compared them to 70,000 people without the disease. they found it three mutations never found before but said there is still more work to do before they can begin developing new treatments. we hear about it often, tattoos that are no longer wanted. these relate to breast cancer treatment. mary and shows us how one doctor is helping patients move on by zapping away radiation tax to is. >> -- tattoos. >> it was about a two year process. >> doctors diagnosed him with breast cancer which was 27. she still has the tattoos on her chest and under her arm. oncologist gave it to her to help deliver radiation to precise areas. >> one more thing to remind me of what i went through.

they do certain things just so they're the latest news in the lunchroom. >> reporter: wow.arty? >> sometimes it's not. sometimes people will get a, wow, you got to make out with him? >> reporter: we gathered a group of four teenage girls, 15 to 17 to talk frankly about teen sex. they shared their thoughts with two older women, who admit they were once loose girls. the conversation centered around kerry cohen's new book "dity little secrets" which looks at teen girls and their sex lives. give me a sense of how television portrays teen girls as sex-crazed? >> in the media. that's okay. that's everybody's life and everybody should be acting like that. >> every image they see of girls, whether it be a magazine a movie, a tv show is that a girl has to be sexually attractive. and that's what makes her worthwhile. she has to be sexy. as soon as she acts on that as soon as she acts sexually in some way, then she's called a slut or ostracized in some way. it's the confusing mixed message that hurts a girl's self-esteem. >> reporter: what do you think a girl is after, when she become