Before my father moved in with me, I'd occasionally go up to Cambridge to spend the weekend with him while Barbara was working. "So, are you planning on spending the night tonight?" he'd ask. When I'd announce I was spending the entire weekend, he would look overjoyed, "Oh! Good, good! So..., you'll be here all weekend, then? That's great!" Sometimes, he would ask me this more than once and when he realized it, he would simply laugh and say, "I already asked you that, didn't I? Why am I repeating myself?" and he'd laugh, and then drink another glass of wine. I'm not quite sure why - if his intention had been to regulate his amount of drinking? - but he often drank wine out of a small juice glass. Unfortunately, he had a tendency to continually refill his juice glass. It was difficult to tell whether his drinking confounded his memory, or his memory confounded his drinking. It's hard to know. Today, Dad asked me, "A...