The back of a Apple Power Mac G4 computer and the hard drive. - 

Wednesday's Wall Street Journal reports on a new classified project by the National Security Agency codenamed Perfect Citizen. The NSA is working with companies and government agencies that run critical infrastructure to put sensing devices on their computer networks.

Siobhan Gorman reported the story for the Journal. We speak to her for an explanation of how it will work and, since it's classified, how much we're ever likely to learn about it. We also check in with Stewart Baker who served as Assistant Secretary for the Department of Homeland Security. He's the author of a new book, Skating on Stilts: Why We Aren't Stopping Tomorrow's Terrorism.

And to lighten things up, just a bit, we briefly examine the curious case of the Double Rainbow Oh My God video.

Follow Jeff Horwich at @jeffhorwich