
Shermer and Halpern discuss: definitions of universe and types of multiverses • Is the multiverse science, metaphysics, or faith? • theists claim the “multiverse” is just handwaving around the God answer • many worlds interpretation of quantum mechanics? • inflationary and Darwinian cosmology • infinity and eternity • multiple dimensions • string theory • cyclical universes • Big Bounce • Anthropic Principle (weak, strong, participatory) • time travel • sliding doors, contingency, and the multiverse.