The second law of thermodynamics states that the entropy in a system, such as our universe, always increases. The third law, however, says that entropy reaches zero as a system approaches absolute zero temperature.
Our universe has been cooling off since its origin (because of its expansion), accounting for a myriad of interesting physical bodies and processes, but how is this not at odds with both thermodynamical laws? If the system that is our universe is cooling (and indeed slowly approaching absolute zero), its entropy could be said to decrease. The second law however dictates that it must increase invariably. Which is right?