What would you say is the most clear-cut predictor of how someone will behave in the future? If you said "past behavior," you've hit the nail on the head.  Sure, people can surprise us by radically deviating from prior behavior, but this tends to be the exception rather than the rule. For example, if your friend routinely exhibits a noticeable aversion toward silly comedies, chances are he will continue to loathe such movies. If your sister displays an acute dislike of seafood, she's bound to avoid lobster, crab, and all manner of sea creatures for the foreseeable future. When it's hard to decode a person's true intentions, you have only two tools you can leverage: your gut and, you guessed it, the person's track record. If you lure someone away from a competing firm to come work for you, rest assured they can be coaxed into bolting from yours. If someone cheats on their spouse with you, who's to say they won't cheat on you with som...

Let's assume you've been friends with Katie since kindergarten. Even as innocuous six year olds, you knew you'd be each other's maid of honor. While time often makes many friendships grow weaker, the two of you remained almost inseparable through college. Then, gradually, you begin to have sporadic arguments with each other, sometimes over the silliest things. As relationships and shifting responsibilities chart different paths for you both in your adult life, you start to grow apart. Once touting yourself as sisters from a different mother, you're now mere acquaintances who may connect via text on special or solemn occasions, like birthdays or the death of a loved one. Is the scenario described above all that atypical? Sadly, the answer is no. You've likely experienced it at some point with a friend you have held in high esteem for many years. While many friendships can bounce back, they may never go back to the way they once were. But that ...

Human beings have a tendency to stick it out with costly decisions, and it can be attributed directly to the sunk cost fallacy. According to this psychological concept, the more we invest -- whether it be money, time, or emotions -- the less likely we are to abandon our initial choices. There are many examples of the sunk cost fallacy in action. For example, if you've invested $10,000 in a women's studies degree even though you recognize your job prospects following graduation are looking a tad bleak, you're likely to press on. Or, perhaps you've been waiting in the same line at the grocery store for nearly 10 minutes while others around you speed by. You've waited this long, so you refuse to budge. Or maybe you insist on getting through the final two chapters of the mediocre book you're reading, or wrapping up the last season of the show you've been watching for several years. After we commit, we tend to bind ourselves to our own decisions, an...

When life has you feeling down on yourself -- whether it's because you're stressed at work or beset by problems in your marriage -- letting go is usually the first step toward getting things back on track. Here are some ways you can let go and infuse your life with positivity: Let go of what you thought should happen and live in what's happening. Let go of your grudges, for they will only cause the resentment and bitterness in you to fester. Let go of your notions of how people should think or behave in a given situation, for the higher you set your expectations of others, the more likely it is they'll fail to meet them. Let go of feelings of envy or jealousy you may feel toward those whom you perceive as more accomplished. Rather than compare yourself to others, compare yourself to the person you were six months ago or a year ago -- for that is a far better benchmark for measuring progress. Let go of the past. It's behind you now. All you can do is ta...