the man driving the car is gregg bergersen. he's a civilian analyst at the pentagon with one of the nation's highest security clearances. his companion is tai shen kuo, a spy for the people's republic of china. bergersen knew a secret that the chinese desperately wanted to know, and neither man knows that what they're about to do is being recorded by two cameras the fbi has concealed in their car. >> let you have the money. >> oh, oh. are you sure that that's okay? >> yeah, it's fine. >> welcome to 60 minutes on cnbc. i'm bob simon. in this edition, we turn our attention to some foreign intrigue. first, a story about a mysterious computer virus that struck an iranian nuclear plant. later, the report of how american agents hunted a notorious arms dealer. and finally, an account of a chinese-american spy trying to steal u.s. military secrets for china. we begin with the story of stuxnet, a computer virus considered to be the world's first destructive cyberweapon. it was launched several years ago against an iranian nuclear facili