Dear Mr. Science,
OK, so this is slightly off the economic and political topic, and it is slightly gross, but I think we've all wondered about this before. An associate of mine has made the claim that the odors associated with flatulence are in fact due to "aerisolized fecal matter" which I find hard to substantiate. The following article incidates that Hydrogen sulfide is responsible for the smell, but there must also be a reason why there are such a wide variety of odors available. I submit to our resident expert on methane gas a request for a reasonable explanation in this matter. If you're about to ask, here is the definition of aerosolized. Thank You.

Howstuffworks "What causes flatulence?"