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Wonders of the Human Body “How Do It Know?” There’s an intestinal structure that is not very famous But deserves great credit, and that’s the human anus. It practices active, but discrete discrimination In the never-ending process of waste elimination. And due to its location it receives adverse attention In the continuing duty of thoughtful retention. Scientists proclaimed matter’s form in three types of status But already the anus could differentiate: firm, fluid, or flatus But “how do it know”which substance to safely pass When confronted with solid, liquid, or gas? And fortunately “it do know” and doesn’t need to think As it completes each task with a self-satisfied wink! Wallace D. Brown Journal of Pediatric Gastroenterology and Nutrition 1995;20(4):481 Permission for reuse granted by Wolters Kluwer Health, Inc.