Kayla Harrison wins nation's first gold in the sport
                                
                                
                                    (Newser) -
                                    For the first time in Olympic history, the United States has taken home a gold medal in judo. Kayla Harrison won the top spot in the 78-kilogram division today,  the AP  reports. She defeated Britain's Gemma Gibbons, who won silver, throwing her twice in the final. Harrison, a former...