Here’s how Google Glass works – it’s like wearing a Drone on your head!

That’s what Michael Chertoff, former US Secretary of Homeland Security and now a consultant, told CNN anyway.

Which may be overdoing it a bit; most people these days seem fairly happy to trade an invasion of privacy for the latest gadget and Google Glass, the new wired interactive specs, looks likely, from this primer, to be a huge success with crazy techies (that is, most of us).

It’ll be interesting to see what happens when these things finally hit the mass market. Will people get run over because they’re watching the latest video or sending photos to their friends? Maybe Google should instal a satnav for pedestrians.