There's a story going around about a college student who stayed up all night preparing for his zoology test. He entered the classroom and saw ten stands each with a bird on it, each bird covered with a sack with only the legs showing. The professor instructed the students to use the legs to identify each bird by name, habitat, genus, and species. The perplexed student, sitting in the first row, was consumed by despair. All legs looked alike. Enraged, he approached the desk of the professor and exclaimed, "What a stupid test! How could anyone identify birds by looking at their legs?" He threw the unmarked test on the teacher's desk and headed for the door. The professor was taken by surprise. He didn't know the names of all of his students so he called after the young man, "Mister, what's y…