New mapping downgrades McKinley by 83 feet
                                
                                
                                    (Newser) -
                                    The tallest peak in North America is a smidge shorter than thought: Mount McKinley is actually 20,237 feet high, down 83 feet from the previous measurement of 20,320, reports the  News-Miner  of Fairbanks. The new figure has nothing to do with shifting plates or melting glaciers, it's...