In his recent much-vaunted book, 'The Future of the Internet—And How to Stop It,' Jonathan Zittrain paints a frightening picture of the state of the net. One of the perils of which he is particularly scared is hacking. Interestingly, he advocates that our computers have two modes: red and green. In 'green' mode, the system is hermetically sealed and only approved programs can run, only safe traffic is sent and received, and safety is paramount. By contrast, in red mode, it's every man for himself. You can download and run any software you want, and, should you catch something nasty, there would be a 'restore' button that would wipe the offending lurgy and return you to your default settings. This idea has merit, for it gives you the choice whether want to into 'the big pool' or 'little pool', as the whim takes you.