"Zero Days" director Alex Gibney talks with Recode's Peter Kafka about his new film's focus on the Stuxnet virus, which sabotaged the Iranian nuclear program. He compares Stuxnet's attack to the first nuclear bomb attacks on Hiroshima and Nagasaki and calls for countries to open a dialogue about cyberweapons. Gibney also discusses his other documentaries, including "Going Clear," "Steve Jobs: The Man in the Machine" and "Enron: The Smartest Guys in the Room."