Throughout the world, people inhabiting the hill areas have remained undeveloped while others have undergone unimaginable changes. One reason may be that the transportation by the sea was comparatively easy, in very early times, when the whole continents were covered by forests. Travel allowed people to come into contact with the rest of mankind, enabling them to learn skills unknown to the local population.Thus early civilizations developed either along the sea coast or by the side of rivers.Athens, Cairo, Kashi etc. are examples of early civilization. The tribals have genetic differences too, because, in spite of the efforts by United Nations, Africans have remained backward in education.. At the same time, they have good teeth and they are good singers and athlets! People of Andaman islands refuse all attempts to befriend them. This is something which calls for serious study.
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