Euphemism of the Day

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Analysis of this collected gas has confirmed the five major components of intestinal gas to be nitrogen, oxygen, carbon dioxide, hydrogen, and methane. Of note is that these five gases, which constitute nearly 100% of bowel gas, are all nonodorous. The human ability to detect the presence of extremely small quantities of malodorous gases, such as hydrogen sulfide, can be credited to the remarkable capacity of the olfactory sense.

-from "Chapter 90: Abdominal Gas"