We can often look at other people and think that others have it so much better. Perhaps less often, we perceive glimpses of poorer societies and we think that others have it so much worse. Even in our own lives, the intensity of difficulty can vary dramatically. Sometimes we can feel as free and happy as a free and happy bird flying through the air, and yet at other times we feel loaded down like a heavy load, low on energy or motivation. Why do these weights of life vary so much, in variety and in strength?
