Happiness is difficult to define and even harder to measure. We experience it as a combination of elements, in the same way that one wheel or spring inside a watch doesn't keep time it is a result of the synchronicity of the whole. As a relative state, happiness is what psychologists call our "subjective well-being" and, fortunately for us, it is a state that we can actively change for the better. Here are 20 ways to start.
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