I’ve spent three decades learning how to alter people’s memories. I’ve even gone so far as planting entirely false memories into the minds of ordinary people – memories such as being lost in a shopping mall, cutting your hand on broken glass or even witnessing demonic possession as a child, all planted through the power of suggestion.

Psychological scientists have learned so much about planting false memories that some say we almost have recipes for doing so. But we haven’t seen anything yet. Over the next 50 years we will further master the ability to create false memories. We will learn …