and exercising becomes associated with a reward, and it becomes a habit, it becomes a lifestyle. So, we can reward ourselves and others now for behaving in ways that are good for us in the future and that's a way for us to bridge the temporal gap. And the third principle is progress monitoring. So, the electronic board focused the medical staff attention on improving their performance. This is an image from a study that we conducted, that shows you brain activity suggestive of efficient coding of positive information about the future.