“The method of basing general statements on accumulated observations of specific instances is known as induction, and is seen as the hallmark of science. In other words the use of the inductive method is seen as the criterion of demarcation between science and non-science. Scientific statements, being based on observational and experimental evidence - based, in short, on the facts - are contrasted with statements of all other kinds, whether based on auth ority, or emotion, or tradition, or speculation, or prejudice, or habit, or any other foundation, as alone providing sure and certain knowledge. Science is the corpus of such know ledge, and the growth of science consists in the endless pro cess of adding new certainties to the body of existing ones.”