The labels “introvert” and “extrovert” have been around for a hundred years to describe two personalities we all know well. Introverts are reticent, quiet, and quite enjoy being alone. Extroverts are more sociable, generally louder, more talkative, and more active. These are stereotypes of course, but where would we be without stereotypes? Most of us have no trouble in accepting one or other of these labels for ourselves, and for me it’s easy. On a test of introversion, I scored 100 percent, which is the best I have ever done on any test.