I often imagine what it would be like if my father were still here to mark his 100th birthday, if Alzheimer's hadn't clawed away years, possibilities, hopes. What would he think of all the commemorations and celebrations?

I think we can work through a lot of political and international problems, but what really frightens me is what's happening environmentally.

When I was a child, our summer days were spent swimming; chlorine in my hair was like perfume to me.

The memories stayed with him for so long, and stayed vivid. And it didn't matter to me that he'd already repeated that before. I could hear it forever.

The house I grew up in had large plate-glass windows, which birds frequently crashed into headfirst. My father helped me assemble a bird hospital, consisting of a few shoe boxes, some old rags, and tiny dishes for water and food.

I would not call myself a veteran conspiracy theorist. Or an obsessed one. I pretty much peaked on the whole conspiracy theory thing in the '60s, with the grassy knoll, who really killed JFK, and who ordered the hit on Lee Harvey Oswald.

Laura Bush went on national television during the week of my father's funeral and spoke out against embryonic stem cell research, pointing out that where Alzheimer's is concerned, we don't have proof that stem-cell treatment would be effective.