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The compass and different navigation tools had been already in use within the Indian Ocean long earlier than Europe. (�Nav� is the Sanskrit phrase for boat, and is the basis phrase in �navigation� and �navy�.) Using their experience within the science of seafaring, Indians participated within the earliest-recognized ocean-based buying and selling system. Deadly illnesses similar to small pox, plague and polio have induced a large number of epidemics resulting in main loss of life. Researches and scientific effort led …