dr. petersen. i was -- i'm on the budget committee and we have the budget on the floor so i vent been here for the whole hearing. could you be a little bit more specific about what you think the prospects are or a cure, how confident you are, how many viable paths towards a cure there are so that a nondoctor like me can get a sense of how much confidence we can have? ronald: thank you, senator whitehouse. difficult question to answer, of course. there is enough exciting research. this is a complex disease. it's not just a single cell disease but really involves networks in the brain so there are multiple targets out there and we're somewhat encouraged by a report just last week that one of the drugs that's under investigation for alzheimer's disease to remove one of the culprits, the plaques, the amyloid plaques in the brain. one result indicated in fact there may be a path forward for this therapeutic in so far the plaquing were reduced as they measured them in patients over the year and the patie