What are their purpose other than to irritate us and land on us, as if we’re short of some sort of something that stinks… I know they like natural gas… It’s one way to identify gas leakage. I know they transmit disease and constantly looking for a place with warmth to lay eggs. I’ve researched FLIES and I haven’t any answers for their being. I think they are here to play with shit, after all, flies taste with their feet . Then, it’s why files are full of shit ,just like people . Except they are HOUSE FLIES.