Have you noticed how we come to value a moment or experience more fondly in hindsight than we do when we're actually experiencing it? In fact, sometimes we may experience an event we find unpleasant at the moment, only to realize later -- perhaps when comparing it to other situations occurring before or after -- that it wasn't all that bad? This can happen for two reasons: 1. We take the present moment for granted. Perhaps because we're too busy dwelling on the past or worrying about the future, we fail to appreciate and live in the moment. Study after study shows that we're happiest when we're focused on the present. 2. We look back on the past through rose-colored glasses.  Perhaps the experience really wasn't as titillating as our memories of it might lead us to think. That's because, when reminiscing about the past, human beings have a tendency to filter out the bad stuff, leaving only the Kodak moments we tend to capture in pictures. Never...