Study of air traffic patterns puts chances at 18%
                                
                                
                                    (Newser) -
                                    Dr. Rick Sacra, the  third American to contract Ebola , landed in Nebraska last week and  will be moved  to the Nebraska Medical Center in Omaha for treatment. Experts insist there is no risk to the public,  NBC News  reports, but a new study in  PLOS Currents  finds that Ebola could...