 We believe that we have free will and this belief is so firmly entrenched in our daily lives that it is almost impossible to take seriously the thought that it might be mistaken. We deliberate and make choices, for instance, and in so doing we assume that there is more than one choice we can make, more than one action we are able to perform. When we look back and regret a foolish choice, or blame ourselves for not doing something we should have done, we assume that we could have chosen and done otherwise. When we look forward and make plans for the future, we assume that we have at least some control over our actions and the course of our lives; we think it is at least sometimes up to us what we choose and try to do.