Happiness

"Happiness, for a culture, is more like a vital sign, the temperature and heart rate of a nation. Like all vital signs, it can fluctuate. but like all vital signs, it has a set point, a level to which it strives to return." -- "The Happiness of Pursuit" (TIME)

Read more: http://nation.time.com/2013/06/27/the-happiness-of-pursuit/#ixzz2XWnkFiDk