The face of the Earth has undergone very remarkable changes in the past half-century. It has changed almost beyond recognition. Rewind time to the 1950s. No mobile phones, no internet, no personal computers. All those things that are essential, or vital for our today’s daily life are missing. The world was devoid of all that we consider essential, and yet, people could live happily back then. Rewind to a millennium back. You will find even more necessary items missing. The most important is electricity. In those days, monarchy prevailed, not democracy. Yet people lived in towns and cities, cultivated food, and lived happily. A few more millennia back, you won’t find that too. Just some small groups of people living near their farms, which are usually located near rivers. (There was no Farmville back then!) No kings or countries, and of course, no wars.