In my view, there are four essential ingredients to a happy life, all of which begin with the letter "L." The 4 L's of happiness are: (1)  Laughing (2)  Loving (3)  Living  (4)  Learning Nothing puts us in a better mood -- and helps turn a frown upside down -- quite like a good laugh. Whether we're watching a comedy movie or being amused by a pet's zany antics, life just isn't as fun without a healthy dose of laughter. But most of us would agree that funny moments aren't as memorable unless we have others around to share them with -- the people we love. While friends and family don't complete us -- we do that ourselves -- they certainly give us a good reason to wake up every morning. They're there for us (many of them, at least) in good times and bad. As human beings, we all yearn to love and be loved.  The next one is fairly straightforward: we can't be happy unless we're living -- literally and figuratively. But some wou...