A philosophy professor gave one question for the final exam. The class was seated when the professor touched his chair & asked: "Using everything we've learned this sem, prove that this chair doesn't exist." The whole class answered for an hour but the laziest student finish the test in less than a minute. One week later, the grades were posted in the class & the lazy student got the highest score. His answer were consisted of just two words: "what chair?" Don't over analyze or complicate things. Simplify and be happy!