What makes people unhappy? Animals are happy so long as they have health and enough to eat. Human beings, one feels, ought to be, but in the modern world they are not, at least in a great majority of cases. If you are unhappy yourself, you will probably be prepared to admit that you are not exceptional in this. If you are happy, ask yourself how many of your friends are so. And when you have reviewed your friends, teach yourself the art of reading faces; make yourself receptive to the moods of those whom you meet in the course ...