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Human history can be divided into three major periods in very much the same way that the development of a human embryo consists of three trimesters. All throughout our past, weve been expanding, conquering, building, destroying, restructuring, and rebuilding again as weve continued evolving. Humanity continued to spread throughout the world, until finally, we conquered everything. A human fetus reaches this condition in the 38th week of its development. For a child, the mothers womb is the