Bothered by flies?

Why do we have flies?  I mean, what purpose do they serve in the great scheme of things?  They are such a nuisance, right? I have noticed that they seem to have a great presence around garbage cans, their personal feeding and breeding grounds.  So, what can we do?  You may choose to take them on with your trusty fly-swatter…smack…smack…smack!!  […]