A new york plumber of foreigh extraction with a limited command of english wrote the national bureau of standards and said that he found hydrochloric acid quickly opened drainage piles when they got clogged and asked if it was a good thing to use. A bureau scientist replied: " The efficacy of hydrochloric acid is indisputable, but the corrosive residue is incompatible with metallic permanance." The plumber wrote back thanking the Bureau for telling him that the method was allright.The scientis was a little disturbed and showed the correspondence to his supervisor, who in turn wrote,"We cannot assume the responsibility for the production of toxic and noxious residue with hydrochloric acid and suggest that you use an alternative procedure." The plumber wrote back and agreed with the bureau- hydrochloric acid works fine. A top scientist- boss of the first two, broke the impasse by tearing himself loose from technical terminology and writing, and sent the following reply... "Don't use hydrochloric acid, it heat the hell out of the pipes."