“I believe there’s a macro-world. Or a macro-universe. But what it’s like is an unknown unknown. Maybe it’s completely different from our own world. Maybe it corresponds exactly, like the posited matter and antimatter universes, and there’s a macro-Earth with a macro-you and -me. In that case, my brain in the macro-world would be large enough to contain our universe’s entire solar system.... It’s a parallel universe, in a way.”
