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Ancient India was the centre of the world. India is the world's oldest and oldest continuing civilization. India has made, by far, the most inventions and discoveries! In fact, the intellectual contribution of India is more than all other civilizations combined! "India was the motherland of our race, and Sanskrit the mother of Europe's languages: she was the mother of our philosophy; mother, through the Arabs, of much of our mathematics; mother, through the Buddha, of the ideals embodied in Christianity; mother, through the village community, of self-government and democracy. Mother India is in many ways the mother of us all". -Will Durant, American historian "India is, the cradle of the human race, the birthplace of human speech, the mother of history, the grandmother of legend, and the great grand mother of tradition. our most valuable and most instructive materials in the history of man are treasured up in India only." -Mark Twain, American author "We owe a lot to the Indians, who taught us how to count, without which no worthwhile scientific discovery could have been made." -Albert Einstein, German scientist "If there is one place on the face of earth where all the dreams of living men have found a home from the very earliest days when man began the dream of existence, it is India." -Romain Rolland, French scholar If I were asked under what sky the human mind has most fully developed some of its choicest gifts, has most deeply pondered on the greatest problems of life, and has found solutions, I should point to India. - Max Mueller (German scholar) Besides the discoverers of geometry and algebra, the constructors of human speech, the parents of philosophy, the primal expounders of religion, the adepts in psychological and physical science, how even the greatest of our biological and theologians seem dwarfed! Name of us any modern discovery, and we venture to say that Indian history need not long be searched before the prototype will be found on record. Here we are with the transit of science half accomplished, and all our Vedic ideas in process of readjustment to the theories of force correlation, natural selection, atomic polarity and evolution. And here, to mock our conceit, our apprehension, and our despair, we may read what Manu said, perhaps 10,000 years before the birth of Christ: The first germ of life was developed by water and heat. Water ascends towards the sky in vapors; from the sun it descends in rain, from the rains are born the plants, and from the plants, animals. -Louis Francois Jacolliot (French diplomat & author) The multiplicity of the manifestations of the Indian genius as well as their fundamental unity gives India the right to figure on the first rank in the history of civilized nations. Her civilization, spontaneous and original, unrolls itself in a continuous time across at least thirty centuries, without interruption, without deviation. Ceaselessly in contact with foreign elements which threatened to strangle her, she persevered victoriously in absorbing them, assimilating them and enriching herself with them. Thus she has seen the Greeks, the Scythians, the Afghans, the Mongols to pass before her eyes in succession and is regarding with indifference the Englishmen - confident to pursue under the accidence of the surface the normal course of her high destiny. -Sylvain Levi (French Orientalist) https://answers.yahoo.com/question/index?qid=20110924070541AATaT1N
b. Both has complex social hierarchies