Religions have spent eons honing defenses that keep outside information away from insiders. The innermost ring wall is a set of certainties and associated emotions like anxiety and disgust and righteous indignation that block curiosity. The outer wall is a set of behaviors aimed at insulating believers from contradictory evidence and from heretics who are potential transmitters of dangerous ideas. These behaviors range from memorizing sacred texts to wearing distinctive undergarments to killing infidels. Such defenses worked beautifully during humanity’s infancy. But they weren’t really designed for the current information age.