This story shows how complex Einstein could be.Not long after his arrival in Princeton he was invited by the wife of one of the professors of mathematics at Princeton,to be guest of honor at a tea.Unwillingly,Einstein accepted the invitation.After the tea had progressed for a time,the excited hostess,thrilled to have such a world-famous guest at home,fluttered out into the center of activity and with raised arms silenced the group.Bubbling①out some words expressing her thrill and pleasure,she turned to Einstein and said,“I wonder,Dr.Einstein,if you would be so kind as to explain to my guests in a few words,just what is the theory of relativity?”