Political science is science or not science

Aristotle, the father of political science considered political Science as the master of all sciences. Writers like Laski, Burke and Maitland used the title politics instead of political science.
Social sciences like history, sociology, political science, and economics also follow the scientific method while studying social phenomena. Laboratory tests are not possible in social sciences.
The basic difference lies in the fact that physical sciences study about matter whereas social sciences study about human beings. Hence the results obtained in physical sciences are precise, perfect and exact at all times. That is not possible in social sciences. This does not mean that political science claim to be a science can be denied. It is true that political science cannot be an exact science, since its laws and conclusions cannot be expressed in precise terms and it cannot predict political events accurately. Besides social and political relationships are constantly changing and what may be true of them today may not be true in the future. Hence political science can be called both a science and an art.