Task: Text Categorization
Input (English): This law is apparently contradicted by the Poincare recurrence theorem. The Gibbs paradox deals with apparent violations of this law. Rudolf Clausius stated this law as saying that heat cannot spontaneously flow from a cold body to a hotter body. A hypothetical creature which can separate fast molecules and slow molecules, Maxwell's demon, would violate this law. For 10 points, name this law which says that the entropy of an insulated system never decreases.
Output (English): Science