'''Empirical science''' is based on the [[scientific method]] that requires from the scientist to test a [[theory]] based on [[Scientific observation|observed]] or predicted facts. The scientist must formulate a theory or a [[hypothesis]] based on what has been observed, then design a test by which the theory may be verified as valid or not.<ref>{{cite web | '''Empirical science''' is based on the [[scientific method]] that requires from the scientist to test a [[theory]] based on [[Scientific observation|observed]] or predicted facts. The scientist must formulate a theory or a [[hypothesis]] based on what has been observed, then design a test by which the theory may be verified as valid or not.<ref>{{cite web |