My brother in law in an attempt to keep flies away has covered my inlaws house in half full with water ziplock freezer bags. I asked him to explain the idea science, anyhting that would prove he's right, nothing. I looked it up on google and wikipedia etc. and couldn't find science to back it up. Just a bunch of yah it works! We don't know why it just works. I'm sure this is a plot to sell more ziploc bags. Any body know the science behind it and whether it really works?