The basic elements of life for a human being is Food, Clothes and Shelter among this shelter is considered costlier one in the modern life and in order to achieve shelter early man had invented a hut using trees and leaves and found those things are having strength to with stand different calamities later on year and years passed in modern life came in to light people are dreaming with their dream houses and cement...concrete was invented similarly usage of steel in concrete is widely spread.

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