Supppose that you woke up in the morning with the perfect and complete theory of the World in you mind. The theory from which Quantum Mechanics and Special Relativity and other workaday theories we don't even know about yet could be derived. What could you do with it? And suppose you had access to the perfect computer, one with infinite memory and speed, and which was largely able to program itself. Would you be able to program the perfect computer to use the perfect theory to simulate the Universe from the very beginning of Time to the present?