lac is just a simple little molecule exploring DNA by 'walkng along' the groove and then grabbing on. They make it sound like strolling down the street. How does the molecule 'know' what it is doing? The process has purpose! They said so. It is looking for the right spot. That is teleology, which isn't allowed in Darwinian research. All developed by chance. Tell me how.-http://sandwalk.blogspot.com/2012/07/slip-slidin-along-how-dna-binding.html#more