We endeavour to make the mesh ever finer and finer.
Science is a method or methods of inquiry.
A discipline is a science because of the methods it employs, not because of the topics it studies. The distinguishing features of an empirical science are the reliance on observation and the use of logic. The pure sciences of mathematics and logic differ from the empirical sciences by solely using logic and not using observation. It is impossible to prove a scientific theory. A scientific theory is simply the best explanation of a phenomena that we have available.