schwartz. the john d. and catherine t. macarthur foundation. the miriam and ira d. wallach foundation. josh and judy weston. the cheryl and philip milstein family. corporate funding is provided by mutual of america, designing customized, individual, and group retirement products. that's why we are your retirement company. and by the corporation for public broadcasting. and by contributions to your pbs station from viewers like you. and by contributions to your pbs station from viewers like you. thank you. -- captions by vitac -- www.vitac.com >> rose: welcome to our program, we begin this evening with a look at some interesting new developments in understanding alzheimer. we talk to dr. scott small whose's part of the research effort. >> alzheimer describes the disorder in 1906. but 's quite remarkable that for 40, 50,0 years after that there was no talk, no deception about alzheimer. mainly because it was thought to be part of normal aging. so in the 1980 there was a real serious attempt to try to understand this disorder. and the reason why one should be cautiously optimistic is because rational drug discovery, a basic princip