expand the theme of medicine is a good smile
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early humans life span was likely to 1-40 years.it was a time were no one was scientifically civilized and technically known about total human body .after millions of hit and trail researches and experiments we found that what can give a human life a comfortable and healthy lifestyle.this researches as output gave many good ideas and mechanisms which is used to extend the life span of human to 40 years to average of 68 years.medicine is real smile which help human to cure things and promote life
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