The sound of crying is a sound which is instantly recognized by people all over the world. Not only will you recognize this sound, you may also react by crying yourself. Crying is a universal expression of extreme emotion. You can cry from joy. You can cry in frustration, anger, or from physical pain. But most people cry because they are feeling sad. If you are feeling depressed, you may cry a lot. Yet it is true that not all people will cry when depressed. Crying is a truly subjective...