This chapter is debatable in the sense that it raises the question whether people are happy and contented due to agricultural, scientific and industrial revolutions that have happened. However, Prof. Harari claims that since the inception of scientific revolution there has been correlation between power and happiness, and this is to demonstrate that revolutions which happened as indicated in the history made people happy, but in the present this is debatable because in modern age people are still not happy despite the emergence and success of permanency of scientific and industrial revolutions.