I'm reminded of the story about the rural health worker who tried and tried to get a local farmer to screen his windows (wire gauze to unAmericans). The old guy simply refused, even when the worker told him that the flies even came from the outhouse. "Oh, don't be silly!" was the farmer's response, "All I have to do is put some lime down in there and if there's any problem it's fixed."

Some weeks later, the health worker decided to make one more try. Imagine her surprise to see the entire house was sporting brand new screens on the doors and windows!

"Why did you change your mind?" she asked the farmer, wonderingly.

"Little white tracks on my food," was his only answer.