Holy flies...........

So I am not sure what the dealio is with the flies today. All of the windows are closed unless they have a screen on them. The screens are secure. In my kitchen alone I have swatted and destroyed over 25 flies. I think I may die. They are making me sick. Where in the world are they coming from? Well, I know where they are coming from (hello, horse poop.....) but how are they getting in? Ugh.................