Katie Ledecky is on a historic run of her own
                                
                                
                                    (Newser) -
                                    Michael Phelps scored his 20th and 21st gold medal Tuesday night with yet another performance for the ages. First, he won the 200-meter butterfly, a victory that sent him climbing into the stands to kiss his 3-month-old son, Boomer, the  AP  reports. An hour later, he returned to anchor the...