Quantum mechanics and the many-worlds interpretation make the morning after a one night stand between a theoretical physicist and a man from a different universe one to remember. Quantum mechanics and the many-worlds interpretation make the morning after a one night stand between a theoretical physicist and a man from a different universe one to remember. Quantum mechanics and the many-worlds interpretation make the morning after a one night stand between a theoretical physicist and a man from a different universe one to remember. Quantum mechanics and the many-worlds interpretation make the morning after a one night stand between a theoretical physicist and a man from a different universe one to remember.