Scientific knowledge change over time because we discover news things or properties that impacts how things actually work in the science world. What impact these have on society is that it helps us be more aware of the things in our world, apply these newly dicover knowledge into our own lives to make it better, and it is the beginning step to knowing and discovering more about the world that we live in.
Polio dose is provided to small children from villages to that of cities .This is a successful health measure undertaken by government to improve public health. Government also promotes other health measures in free of cost in governmental hospitals .
