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You're driving to work and stop for a red light. You're minding your own business and - bam! - your car rocks forward and backward, slammed in the rear by another car driven by some guy yakking on his cell phone. Or you're a passenger in a New York City taxi. The driver's cruising down Fifth Avenue when

It has long been known that over evolutionary time the human organism developed in tandem with a vast host of microbial fellow travelers. The 100 trillion microorganisms inhabiting our gastrointestinal tracts assist in numerous physiological processes critical to our health and well being. The intestinal