Richard Sale, writing for ISSSource:
“As ISSSource reported, Stuxnet was a comprehensive U.S.-Israeli program designed to disrupt Iran’s nuclear technology. This joint program first surfaced in 2009 and worked in concert with an earlier U.S. effort that consistently sabotaged Iran’s purchasing network abroad.”
(via The Verge.)
According to this report, an Israeli agent introduced the Stuxnet code to machines controlling Iranian centrifuges, destroying them and setting back the Iranian nuclear program by years.
There's a book somewhere in this story.