announcer: this program was made possible in part by the mpt new initiative fund founded by irene and edward h. kaplan. rose: welcome to our program, tonight a special edition, the charlie rose brain series year two. in our 8th episode we consider parkinson s disease and huntington s disease. this is a profound insight which allows us to think that there may be a unifying theme connecting these disorders, and perhaps allowing us to get a completely new therapeutic approach to this. that if we could solve any one of them in a fundamental way we would revolutionize neurology. rose: episode 8 the charlie rose brain series 2, underwritten by the simons foundation. the charlie rose brain series is the most exciting scientific journey of our time. understanding the brain,s series made possible by a grant from the simons foundation, their mission is to advance the frontiers of research in the basic sciences and mathematics. funding for charl ree charliest rose was provi