Superhero science has taught me this: Entire universes fit comfortably inside our skulls. Not just one or two but endless universes can be packed into that dark, wet, and bony hollow without breaking it open from the inside. The space in our heads will stretch to accommodate them all. The real doorway to the fifth dimension was always right here. Inside. That infinite interior space contains all the divine, the alien, and the unworldly we’ll ever need.