I can just add to that.
Remember I told you about the hallmarks of Alzheimer's disease, the plaques and the tangles. They begin decades before the dementia. People who are 30 and 40 who are doomed to get Alzheimer's already are developing these changes in the brain. Right now there is a strategy going on in most countries, including Canada—which is just being pulled together by Dr. Serge Gauthier—to investigate the proposals that have been made for early diagnosis. Ridiculous as it sounds, this includes pre-symptomatic diagnosis. We actually have the tools, if we wanted to use them, that could detect the signs of impending Alzheimer's before you actually have conditions that Dr. Lester was just referring to. But they are not necessarily going to be approved.
They are potentially expensive. One of them, the spinal tap, is invasive and potentially dangerous. If we could do all of those things without any discomfort, then we could actually pick up people, and they could start to address the possibility that they're going to get Alzheimer's even before they have any symptoms at all.