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Gut reaction: Are intestinal bacteria making us fat?

In her most recent Newsweek column, science reporter Sharon Begley summarizes some of the intriguing new research that suggests that weight gain — and obesity — may not be simply a matter of taking in more calories than you expend:[W]hile the basic m

Are you happy? Don’t worry — be satisfied

We Americans may have, as Thomas Jefferson declared (and the Continental Congress confirmed on July 4, 1776), an inalienable right to “life, liberty and the pursuit of happiness,” but are we happy? And what exactly makes us happy, anyway?