July 28, 1902 - September 17, 1994. Austrian-born, British thinker, widely viewed as one of the twentieth century's greatest philosophers of science.
Founder of the theory of falsifiability as a criterion of demarcation between science and non-science.
Basically, the only way to prove that something is true is to disprove it. So, it current scientific dogma, nothing is held as a "Law" until it has been disproved. Therefore "Theory" is the correct scientific rationale as it holds for the possibility of the statement being untrue.
Hence Newton's Laws are Laws as they were disproved by Einstein's Theory of Relativity, however they still hold true in normal sub-relativistic space. However, Einstein's theory is still a theory as it has yet to be disproved.
Or in other words "The Earth is Round" is true because we proved that it was not any other shape, and thus is scientifically true.
"God exists" is untrue, because no-one can prove that he/she/it does not exist. Therefore God is non-science.
A little philosophy....good theory to read about, though his own arguments work against him.
K