There’s an old, true story about a farmer who had a problem with rats. One afternoon he saw two rats on the path in front of his house. He took a big stick and went in pursuit.When he reached them he saw they were walking slowly and carefully, side by side. Each rat was holding one end of a straw in its mouth. He realized one of them was, in fact, leading the other down the path with the straw. Looking closer he saw that the second rat was blind. The farmer put down the stick and went back inside.