North Korea’s nuclear threat may presently have the world’s attention but ballistic missiles capable of reaching the U.S. mainland aren’t the only weapons of mass destruction in Kim Jong Un’s arsenal. Pyongyang’s nuclear capabilities are well understood and high on the agenda of President Donald Trump in his ongoing five-country trip to Asia, but a recent study from the Belfer Center for Science and International Affairs at Harvard Kennedy School reported on a less well known aspect of North Korea’s armaments program: biological weapons. Andrew C. Weber, former assistant secretary of Defense for Nuclear, Chemical and Biological Defense Programs, commissioned the report over concerns that the biological weapons threat received too little attention. “This is an issue that is generally neglected by the national security community,” he tells Newsweek. “Biological weapons are more complicated [than nuclear weapons]; they do not lend themselves to easy-to-understand pictures.” Unlike the testing of rocket technology, the weaponization and cultivation of viruses can be carried out behind closed doors. Experts are unable to attest to North Korea’s development of threatening pathogens, but they do believe the regime has built facilities that could be used to produce biological weapons. Exhibit A in the case of North…