It is the scourge of the elderly: a progressive, relentless disorder. Doctors have greatly improved the accuracy of iagnosis, but they can neither cure Alzheimer's disease nor arrest its victims' horrifying decline, as their minds--and the memories that fill them--grow inexorably dim, then fade away. Indeed, despite all the new knowledge about how the brain works--or perhaps even because of it--medical researchers seem as far from understanding what causes Alzheimer's as they have ever been.
Scientists still do not know, for example, whether Alzheimer's kills nerve cells (neurons) and whether it does so from the inside out or outside in. Supporters...
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