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Let's start by defining happiness and agreeing on what causes it. My definition of happiness is that it's a feeling you get when your body chemistry is producing pleasant sensations in your mind. That definition is compatible with the science of happiness. ... The big part--the 80 percent of happiness--is nothing but a chemistry experiment. And it's hugely helpful to think of it that way. You can't always quickly fix whatever is wrong in your environment, and you can't prevent negative thoughts from drifting into your head. But you can easily control your body chemistry through lifestyle, and that in turn will cause your thoughts to turn positive, while making the bumps in your path feel less important. Let's get to the mechanics of manipulating your body chemistry.