<br>
<br>Before eighteenth century we were plunged in the depths of ignorance and unawareness of scientific knowledge. Without having an adequate scientific knowledge, our ancestors had buried their common senses deep under the mask of ignorant personalities but it was the scientific revolution in nineteenth century that unsheathed it and now we can see that the whole world is globalized due to this scientific revolution. Science has affected human life and culture in many ways and requires numerous books to discuss its impacts on us. So in this essay my goal is only to describe the impacts on health and behavior in comparison with the past and present.
<br>
<br>Before the revolutionary changes in early nineteenth century, health problems and a large number of fatal diseases gulped the whole community like a malicious dragon. The most common health problem was the numerous fatal diseases and epidemics. There was no cure for the most common diseases so these diseases always acted as a catastrophe. In those days emergence of an epidemic always proved as "Pandora's Box" to the whole locality. At that moment average life span was thirty to forty years. Some common disease like Chicken pox, Measles, Typhoid and many different kinds of fevers had killed more than the present American population in last seven centuries through the whole planet. On the other hand if we analyze the ratio of mortality in year 1999 in comparison with the past, we would come to know that these diseases couldn't affect more than some thousands of human lives. As the most descriptive condition of