Why are we only happy when it rains? Why does only a select group of people acknowledge the musical genius of Tom Waits, and when we meet we seem to have so much in common from world outlook to art to liking good-ole sad songs? Susan Cain, author of the book Quiet which gave introverts like myself an understanding of what we are tries to answer this question in her new book Bittersweet: How Sorrow and Longing Make Us Whole. That maybe the sadness we see when we watch a leaf fall, or even a touching advertisement on TV makes us more in touch with the world, and not just a sensitive emo who likes to wear black.Being bittersweet is not mopey, as some would say, or a mood that a person should grow out of, not a weakness that some would use to label. The usual American look to the sunny side, or the religious, God doesn't give you more than you can handle sound much more unhealthy and unrealistic. Bad things happen. To everyone. To quote the Flaming Lips "Everyone you know someday will die." No amount of high hopes or positive aphorisms will change this. However in being bittersweet or whatever you prefer to call it, makes a person more aware, and how things can and will change, for the worse sure, but the better seems much more enjoyable. Instead of learning to turn your frown upside down, live with the frown, but don't let it beat you.Ms. Cain uses an mix of science and personal stories, from her life and from the life of friends both famous and not. The chapter begins with a bittersweet quiz, which after tabulating my scores, left me both happy and sad. The personal stories all fit the chapter and gives proof to that story you have no idea what kind of day the other person is having. The science is a mix of studies on the brain, nervous system and psychology. A reader who finds this interesting is in for a lot of TED talks. Leonard Cohen takes the stage and the power of music, with thoughts on religion, love death and other things that life has to offer.Ms. Cain has written another book that makes people feel seen. That others watch ads and sniffle, puppies playing with babies in the park and have to look away. That listen to the sad songs of bands more than the loud fist pumping works. As a reader you know if this book if for you, but I do think that this is something that everyone bittersweet, sweet, even just candy sweet will get something out of.