The very expression “certainty” is a contradiction in terms. There is rarely such thing as 100% certainty – and everything less than this is uncertain. The very core of science is the deep awareness that we have wrong ideas, we have prejudices. We have ingrained prejudices and these prejudices are organized into equations. For many people this might be a startling claim. Uncertainty does not mean we know nothing, that evidence is unquestionably fraught with misinterpretation. We can say how far we are from the end state, ‘almost certain’ for instance. Our facts and knowledge of the science should always be taken with a skeptical grain salt. Uncertainty in science which in effect means that nothing is real in any absolute sort of way.