we tanner stage pubic hair. if it's a boy, we actually measure testicular volume.the end of the visit, we can decide what if any tests are needed. >> so this is part of the camera, and i'm gonna bring the camera over, and this is what's going to take your picture. >> the first test that i find most useful is the skeletal maturation, which is a film of the wrist to the tip of the fingers called a bone age x-ray. skeletal maturation will show an advancement over the chronological age in a kid who has a true rise of the hormones. >> and then the second thing typically involves blood tests, and here we're measuring hormone levels. and the most important one in terms of evaluating puberty is called lh, or latinizing hormone. this is a hormone produced by the pituitary gland that stimulates the ovaries. then the last thing that the child undergoes would be a brain mri scan. and here we are looking specifically at the hypothalamus and the pituitary to make sure that there's no structural abnormality. >> mcfarland: joshua kellogg underwent a bone age x-ray that revealed hi

study, at age 7, 15% of girls had breast development and 10% of girls were developing hair already, pubicair. by age 8, which used to be the lower limit of normal, it was a much higher rate with 27% of the girls having breast development and about 19% having hair. >> so i know that that is alarming to a lot of families who aren't used to this. it kind of changes our brains. we have to think about this differently. so in your study, i know it's a long-term study, it's been going on for years. what are you learning so far. what are some of the triggers do you think? >> we are looking at a lot of different things. so the things that we're examining are environmental or chemical determinants that may promote early puberty. so for example, we are looking at nutrition, including breastfeeding. our girls at kaiser were girls that were born within keiser. we're able to lock at what kind of feeding their mothers were able to do. and then moving on to asking questions about what they eat on a regular basis now. so we're looking at nutrition. we're looking at location of homes. is your home next to

. >> india has the largest school meal system in the world, feeding 120 million children at pubically run schools. but faith was shattered when 23 children died after eating their elementary school lunch. investigators have yet to identify the exact cause but the incident raises serious questions about food safety at schools. nhk world reports. >> reporter: bihar state in eastern india is home to some hundred million people. it's also one of the poorest states in the country. many hseholds cat afford to make packed lunches for the children to take to school. instead, the children are fed by what's known as the program designed to help poor households and create an environment where students can concentrate on their school work. for more than a decade, india has spent $1 billion a year to provide elementary school and middle school children. it feeds 900 children. >> transtor: i will study har after eating my school lunch. >> translator: thanks to the midday mea program people now come to school every day. they've become fond of studyi. >> reporr: but tragedy at a school in bihar last

. >> pubically this case is considered to be the amanda nox case but really is the meredith case.een lost in the way the case has been covered in the media. >> millions of italians believe this that young woman is a murerror. millions. >> i don't think amanda is guilty of felony murder, but i think she is guilty of being felony stupid. >> the second trial took 11 months to complete. >> even when delivered in italian, the verdict was clear. amanda knox was free. >> in the fall of 2011 after these kids have been in prison for four years, a appeals court threw the case out. overturned it. and they walk and they went home. >> they paid the ultimate price. i wish that they would not always go by what the prosecutor says. actually, they could have had some closure long ago if he had just pursued the most logical trail. i don't think the prosecution has admitted that through the objectivity of their evidence they can conclude who participated and who did not. the fact that it has been put out there for so long that i may or may not have had something to do with the murder they can't let

. >>> pubically this case is considered to be the amanda knox case, but really it's the meredith kercher lot of that has been lost in the way it's been covered in the media. >> millions of italians believe this young woman is a murderous, millions. >> i don't think amanda is guilty of felony murder, but i think she is guilty of being felony stupid. >> the second trial after man da knox and raffaele sollecito took 11 months to complete. even when delivered in italian, the verdict was clear. [ speaking italian ] >> amanda knox was free. >> amanda is free and sollecito, raffaele, too. >> in the fall of 2011, after these kids had been in prison for four years, a perugia appeals court threw the case out, overturned it, and they walked and they went home. ♪ >> while it became a time of celebration for amanda knox, raffaele sollecito and their families, the tragedy of meredith kercher cannot be forgotten. >> the kercher family has paid the ultimate price. i wish that they would not always go by what the prosecutor says. because the prosecutor is absolutely obsessed with this one person, and act

it is only true if you are looking at their pubic research. but we do have to remember two things in life and that is that we do need to be benefiting from research to have more on these americans. but we have to do so with vigilance. that is the myth of informed consent. most of us quite rationally believe that we choose to engage in medical research, that we are guaranteed foreign consent. i that i do not mean that the researcher asks your permission, but asks your permission and it also entails maintaining information about the study. so you have to be told everything that you need to know to be with making an informed decision. you have to get consent, but the that consent is ongoing. when new information emerges, when you find out that some people don't fare well, you may have to tell you that you have to get this information. the reality is that it is under assault in this country. it is diminishing very quickly and a very cold and shadowy way that is not getting a lot of attention. but the law was rewritten twice. federal code of regula