Silicon Valley life expectancy has jumped from 72 to 80 since 1961....

But other scientists stressed that there is likely not one primary cause.

It isn't like a game of dominoes, where you "flick one and they all go tumbling," said Paul Terry, an assistant professor of epidemiology at Emory University in Atlanta.

Causes vary in different parts of the country, and each region typically has a number of reasons for the lagging life expectancy rates, Terr...

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Submitted by admin on Wed, 2008-04-23 04:40.