To Know or Not to Know?

Alzheimer's disease, when the lights go out to the point that you don't recognize your own family, is one of the cruelest afflictions, as much for the once-loved ones as for the oblivious victims. There is no cure, and little treatment beyond a bottomless well of patience. But what if, as a healthy young person, you were told for certain that Alzheimer's was going to strike you down in your 40s or 50s? Would that foreknowledge be insufferable?

Not according to José Luis Molinuevo, who this month delivered just that information to some 20 people. If they are...

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