“What is it that differentiates human beings most revealingly? Some say it is their varying degrees of compassion; others say it is amounts of prudence; still others, people's differing appreciations of beauty, or whatever makes them angry. And there are other possibilities worth considering. But in truth nothing is so revealing as a person's sense of humor.” It is not very hard to notice the many differences between people. There are thousands of things that differentiate us. Appearance is of course the most obvious but in reality a ....