Anybody frequenting the GN Forum will have noticed the presence of certain individuals who consistently appear to know everything better than most, regardless of the subject being discussed.  For me the Coronavirus thread is a fine example of the 'Dunning-Kruger Effect' (image below for those unaware of what I mean) / 'better-than-average effect' in action.  Throw some posters some stats from the news and... well, you know the rest.  So how prevalent is it on here?  Are most posters guilty