There is no experiment that can be done to prove an opinion false. Facts, on the other hand, can be scientifically tested. For example, the theory of gravity is used to explain why we do not float around. Science does not define truth. He believes that there can be truth in science but that is never absolute or final.
Facts can lead to probable truths but never to absolute truths.
He believes this is true because the limits to our experience are infinite and also because our frames of reference may be different. A theory cannot be proven true because there is always some chance for error. A theory, however, is the closest we can get to proof that something is true. By proving that theories are untrue, we come closer to finding what is true. Plant Physiology Website.