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Abstract
human history can be viewed as a long serious of technological changes. Just a few of the crucial ones are the discovery of the usefulness of fire at least 350 millennia ago, the appearance of food production more then 10 millenia ago, the construction of urban centers more than 5millennia ago, the invention of mechanized large scale industry a few centuries ago, and the invention of nuclear power a few decades ago. Many of th inventions had important effects on the size and distribution of world population .The use of fire reduced mortality by providing better protection against wild animals and permitted settlement in areas with temperate and cold climates. Many later inventions also helped reduced morality rates and promoted either decentralization or centralization of population. World population grew from very small numbers at the time when human beings began to use fire to morethen four billion today; and the rate of growth accelerated as well ,especially in resent centuries. This multiplication of world population would not have been possible without successive technological changes.