It is a huge cultural phenomenon and it is very serious. We build up whole cultural intellectual patterns based on past “facts” which are extremely selective. When a new fact comes in that does not fit the pattern we don’t throw out the pattern. We throw out the fact. A contradictory fact has to keep hammering and hammering and hammering, sometimes for centuries, before maybe one or two people will see it. And then these one or two have to start hammering on others for a long time before they see it too.