The Races and Languages of Mankind
We cannot say in what part of the world man first came into existence, nor do we know where the first human settlements were. Perhaps men came into existence in several parts at more or less the same time. It is likely, however, that when the great glaciers of the Ice Age were melting away and going back towards the north, men lived in the warmer regions. When the ice went, there must have been vast steppes, something like the tundras which we have in Siberia now. These must have become grasslands, and men must have wandered about them as they wanted grass for their cattle. These people who have no fixed place to live in and are always wandering about are called 'nomads'. Even now, we have some nomads in many countries, including India, like the gypsies. People must have settled down near great rivers, for the land near the rivers was very rich and good for agriculture. There was plenty of water and it was easy to grow food on the land. So we suppose that people settled