Let’s take a quick test. Can you recall a legendary football match of your favourite team or your first date (yes, the one from school days!). I bet that you remember exactly the emotions and feelings from that day. You can rewind your memories frame by frame, like an old movie tape. This is only a retrospective but in your imagination you are still in the middle of the action. I know this feeling. It is very pleasant. Some visual aspects are alive despite the passing of time. However, often we can’t recall the exact dates of those unique moments. Why is that?