we have norman spack with us. he is one of the pioneers in the united states of pedestrian atic endocrinology without can help people make a decision as to whether or not they should go on with their idea that they're in the wrong body and actually lead to transformation. and he has adopted a european strategy and really applied it in the united states of postponing puberty so people can think through what they actually want to do. and make the decision in an intelligent and thoughtful fashion. and the reason he wants to delay puberty is once puberty forms it's a much more radical procedure than if you proceed before puberty. >> we have catherine dulac with us again an old friend who was here last time. she's interested in how sex is represented in the brain. and she has found in mise amazingly that in the male mouse there is a representation of the female. and in the female there is representation of male. this is not a completely novell idea. freud not working with pius but-- mice but working with people suggest

also here, a group of scientists -- norman spack of boston's children's hospital, catherine dulac of harvard university, melissa hines of the university of cambridge, and janet hyde of the university of wisconsin at madison. i'm pleased to have all of them here and to begin this conversation with my colleague eric kandel. what are we going to talk about? eric: we will talk about gender identity and the biology of the brain. this is a marvelous topic and i like it particularly because it shows how brain science can be liberating in our life. as we understand the biology of our own gender identity better and become more comfortable with ourselves to become more empathic to somebody else's gender identity, we can understand it at age 9, 10, a person says i am in the wrong body. we really can sympathize with them and understand what is going on. but, this is not only an interesting topic, it is an unbelievably timely topic. when we began talking about this six months ago, it was not on the radar screen. we were ahead of our time. but now, you cannot pick up an issue of "the new york time

it has dropped 30% in the past month, spacking fears about the health of the world's second largest economy. u.s. stocks having a huge comeback on tuesday after being down 218 points, the dow closing up 93 to 17776. scott, back over to you. >> thank you. >>> san francisco house prices are out of control, and the bravo cable channel has taken notice. million dollar listing san francisco premieres tonight on bravo. guys, they say the show follows the lives of three ambitious hot to trot real estate agents as they try to outsell each other in a couple markets filled with young tech millionaires. so that's a show i won't be watching. >> i love that show. >> do you? >> a lot of people have those shows, they don't want to admit it publicly they watch. bravo and specifically million dollar listing i can't get enough of. >> i think we own bravo, but the one where you have to choose one of three houses, i like that one. >> we're going to prod you for more information the next time you come up here about your dirty show pleasures. >> house hunters. there you go. >> you have time to watch tv? >> three