The most basic prediction we make about the physical world is whether it is stable, and hence unlikely to change in the near future, or unstable, and likely to change. We see not just a wineglass near the edge of the table but a wineglass about to smash on the floor not just a plastic chair but one that can (or cannot) support our weights not just a cup filled to the brim with coffee, but a cup at the risk of spilling over and scalding our hands. Although some of our predictions are related to social situations concerning other people and what they will think and do, many of our predictions concern the physical world around us. Successful engagement with the world requires the ability to predict what will happen next.