Introduction: Public science is a science directly related to the population. Junk science is considered to be one of the most powerful aids for the development of the public. The definition of rapid and slow population growth, birth rate, causes of mortality, population growth, gender and health status etc. are discussed. And the matter becomes very light. However, there is some controversy about the scope of this science Scientists like Louise Thompson have done a good solution even if there is. As a result, public sciences have become more prosperous and innovative.