Noting that the journal Science last week published the second of two controversial bird flu research papers, in which a team led by Ron Fouchier of the Erasmus Medical Center in Rotterdam created a mutated strain of the virus that spreads easily among ferrets, a Washington Post editorial writes that "this is not the end of the story. Rather, it marks the beginning of an important chapter for both science and security." The editorial continues, "The United States and other nations need a more sophisticated process for vetting research for possible security threats without discouraging or impairing scientists," adding, "This is more difficult than it sounds."