Forget tedious public comment periods or dry Federal Register notices. U.S. EPA, it turns out, can change the rules simply by quietly posting new language on a back page of its website. That is what Matt Armstrong found out. A lawyer who closely follows the issue of "hydraulic fracturing," he was poking around on the EPA website last June and was stunned when he realized the agency had added new language requiring drillers to get permits if they are going to fracture with diesel fuel.