So today when the paper's staff say there is nothing unusually provocative about the Charia Hebdo issue - with its front-page cartoon of 'guest-editor' Muhammad -- they are being perfectly truthful.

BBC: Charlie Hebdo and its place in French journalism

After strapping a familiar Mindwave mobile headset to this editor's skull, a companion iPhone app sprung to life, reading off relaxation levels and assigning cartoon faces to the user's mood.

ENGADGET: Neurowear wants to read your mind, geotag your feelings (video)