bob blackwell was a cia analyst and manager for 30 years. at's him with the first president bush who wrote at bob's retirement, bob blackwell is one of the brightest men i've ever worked with. he has his sense of humor but words can be tough to find. >> if something is just there, it's in there and i can try to get it. but it's hard to get. >> reporter: bob knows his 97- year-old mother has alzheimer's. >> it's tough. >> reporter: but when asked he has symptoms? >> not that i know of. maybe there's something out there but i haven't run into anything or -- or somebody said hit the -- or what -- anyway. >> reporter: bob and carol write a blog about alzheimer's for "usa today." >> people really can't understand unless they're living with it. it is very difficult. it's a horrible disease. just horrible. relentless. it doesn't stop and it's very hard. you never really adjust to it. uh-uh think you've adjusted to one state, then things change and you have to readjust again. so it's never ophiura mind. you're never free. >> reporter: that surprise f

bob blackwell was the cia analyst and manager for 30 years, and that's him with the first president bush who wrote at the retirement, blob blackwell is one of the brightest men i've ever worked with. >> [laughter]. that was wrong. >> he has his sense of humor but words can be tough to find. >> if something is just there, i can try to get it, but it's hard to get. >> bob knows his 97 year old mother has alzheimers. >> it's tough. >> but when asked if he has symptoms? >> not that i know of, but maybe there is something out there, but i don't, i haven't run into anything or somebody hit the robot, anyway. >> bob and carol write a blog about alzheimers for usa today. >> people really can't understand it unless they are living with it. it is very difficult. it's a horrible disease, just horrible. it doesn't stop and it's very hard. you never really adjust to it. you think you've adjusted to one stage and then things change and you have to readjust again, so it's never off your mind. you're never free. >> and that surprise finding this week on that new drug that might reverse the disease? >> w