Microbiologist Emma Allen-Vercoe invented the Robogut, a mechanical device that mimics conditions in the human colon. Courtesy of thestar.com hide caption

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Courtesy of thestar.com

Packages of Activa yogurt, which contain probiotics, on a grocery shelf in Chicago. M. Spencer Green/AP hide caption

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M. Spencer Green/AP

Confusion At The Yogurt Aisle? Time for Probiotics 101

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