Researchers working out of MIT’s Picower Institute for Learning and Memory have identified an enzyme, Cdk5, that can inhibit in rats to prevent learned fear responses. The research has practical applications in the areas of phobia and post traumatic stress treatment. This is just the latest in a series of research in the neurosciences that are leading to a near-complete mastery of how we feel and even what we think. A future is possible in which our descendants will look back at us in amazement that we ever felt an emotion that we didn’t wish to feel.