Every year, at results publication, there are queries as to whether the increased number of high level passes is evidence of dumbing down of school education.
Similarly, every day, at a set of double doors, the evident confusion leads to the suggestion of a more fundamental dumbing down of society.
Double doors should be such a simple idea. Take those at the cinema, with the doors that are passed through when entering or leaving a film. Almost without fail, the audience will queue and push to get through the single door that is being held open, ignoring the fact that the other door, which is not locked or fixed, would allow exit of twice the number of people. If like me you choose to exit by opening this other door yourself, no-one will be prepared to hold it or pass through after you, presumably because it will bring misery and pain upon them, the door curse, or maybe they fear that they will fall into a parallel dimension.