Emma Seppälä, Stanford researcher and author of "The Happiness Track," explains the proven benefits of a positive outlook; simple ways to increase your sense of well-being; and why it's not about being ecstatic or excited all the time.Emma Seppälä, Stanford researcher and author of "The Happiness Track," explains the proven benefits of a positive outlook; simple ways to increase your sense of well-being; and why it's not about being ecstatic or excited all the time.