majid fotuhi. make a pledge of $80 and we'll send you dr. otuhi's book, "crosswords to keep your brain young," the six step age-defying program. if you would both, the crosswords book and dvd of the show, please make a contribution of $160 and we'll send you both. help support this show and all the other great programs that you watch all year long on public television. please call now. >> i'm rhea feikin here with dr. fotuhi. you have such a positive attitude that is absolutely contagious! have you always been so positive? >> dr. fotuhi: i feel quite passionate about this subject. i think that there are so many things people can do to stay younger, to stay sharper,