they're bad at probableistic decisions, which this is. they're bad at emotional decisions, which this is. i'd like to think i'm pretty good at that. but just trying to say, either orally or in writing to my wife or my children what i would want, there's such a vast range of circumstances looking forward that you know the simple kind of example we give people about the doctor said says, well, you have an x percent chance of survival, and by the way, here's what will happen, what kind of pain and suffering you'll go through, it isn't like that, and probably most doctors aren't very good at giving those kind of probabilities anyway. so while i'm kind of all for bringing in the patient, i'll have to turn into an economist if i wasn't, i think it's very, very hard to do this in practice and then pretend we've made a big advance. now that's not saying in some cases we clearly could do this. no doubt about that. but as one starts to push this and get close to it, i think it's hard. i'd be interested in what brad has to say about it. >> if i coul