Here's my answer:
Slowing the onset of Alzheimer's is my reason for doing a lot of things. I'm just expecting it to happen to me since it's so rampant in my family, so I do what I can to slow it's inevitable coming (in decades from now), including better diet, trying to learn new things and activism.
The other week, I had everyone in my family send letters to our legislators. I wrote a generic letter, which I posted on my main blog. I was prompted by a "Talk of the Nation" show on Alzheimer's (in which, horror of horrors, I AGREED with Newt Gingrich about things!)