|Please accept my resignation. I don't want to belong to any club that will accept me as a member.|
|—Groucho Marx (1895-1977)|
A paradox is a statement that seems to lead to a logical self-contradiction, or to a situation that contradicts common intuition. The word "paradox" comes from the Greek para ("beyond") and doxa ("opinion" or "belief"). The identification of a paradox based on seemingly simple and reasonable concepts has often led to significant advances in science, philosophy, and mathematics.