Appendix Not Useless, Study Finds

Researchers say they have discovered the purpose of the appendix: It houses and protects some of the body's good bacteria.

Dr. William Parker, an associate professor of experimental surgery at Duke University who collaborated in a study of the organ, says that the appendix acts as a "reserve supply" of good bacteria. But he tells Andrea Seabrook that humans do not really need the organ anymore, because bacterial outbreaks like dysentery are so rare.

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