mr. sesno: what are you talking about? mr. roper: if you could edit, you could undo those. you have the poison and the nuclear, and the way a weapon has no edited once you pull the trigger. you have to deal with the confidences and those consequences are dire. it is the reversibility of strategic effect that i think will be difficult and challenging for us because it will feel like it has the effect of weapons that you cannot take -- butut it will be have it will have that take back ability. what thatard about means for warfare, you have to keep up with the science. to the point earlier, a lot of defense is trained in things we centuries, radars, fighters, stealth, summaries. we are not pushing people hard in my allergy. we're not pushing people heart insights. >> it will be much more difficult to detect with genome pathogen higher lead -- a highly virulent mr. lieberman: pathogen. mr. lieberman:i'm using a term where it is not related, but it will be, with an unconventional threats we are faci