we begin tonight with word today of a real glimmer of hope in a disease that s shattered so many american families. news of a new clinical trial that could lead to a treatment to prevent alzheimer s disease. millions of americans live in constant daily fear of it, millions more are living with it. and, of course, millions more are caring for them. the numbers, in fact, are bad, almost five and a half million americans are currently living with the disease. and that, by the way, makes it an epidemic by any measure. the experts say by 2050, that will go to 16 million americans, at a cost of over a trillion dollars to treat it. it s why the government has launched a war on this disease. and all hopes are now riding on this research and a treatment that could prevent it. it s where we begin here tonight with our chief science correspondent robert bazell. reporter: roughly every hour, another american develops alzheimer s disease. singer glen campbell is one of them. today his d
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