Updated from original, Republished by Global Research (version of 8 Jan 2010):
If a man is offered a fact which goes against his instincts, he will scrutinize it closely, and unless the evidence is overwhelming, he will refuse to believe it. If, on the other hand, he is offered something which affords a reason for acting in accordance to his instincts, he will accept it even on the slightest evidence.
— Bertrand Russell, Roads to Freedom, 1918
Science and models
True science begins with observations and measurements. These lead to theories and models, which lead to predictions. The predictions can then be tested by further measurements and observations, which can validate or invalidate the theories and models, or be used to refine them.