Science is supposed to progress in a sensible, rational, step-by-step way known as the scientific method. We have an idea, a theory or an hypothesis . This must be in such form that it makes predictions. We design experiments and tests to check the predictions . During the experiments we study, observe, measure and assess. We examine and analyse the results. If they fit the predictions, they support the original theory. After double-and triple-checking the experiments and results, we can move to the next stage.