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The eclipse will be the last to span the country till 2045.

captioning sponsored by cbs this is the "cbs evening news" with scott pelley. >> pelley: good evening, alzehimer's disease cannot be cured butting k it be prevented. today the government announced a major study to test a prevention drug in just one family. prevention is almost impossible to measure because scientists can never know which healthy people will develop the disease. but now they have found one family in which nearly everyone develops alzehimer's diseases. more than five million americans have alzheimer's or another form of dementia. that's expected to triple over the next...