perspective of science, W. T. Stace viewed independence from the perspective of the philosophy of religion. Stace felt that science and religion, when each is viewed in its own domain, are both consistent and complete. They originate from different perceptions of reality, as Arnold O. Benz points out, but meet each other, for example, in the feeling of amazement and in ethics. The USA's National Academy of Sciences supports the view that science and religion are independent. Science and religion are based on different aspects of human experience. In science, explanations must be based on evidence drawn from examining the natural world. Scientifically based observations or experiments that conflict with an explanation eventually must lead to modification or even abandonment of that explanation. Religious faith, in contrast, does not depend on empirical evidence, is not necessarily modified in the face of conflicting evidence, and typically involves supernatural forces or entities. Because they are not a part of nature, supernatural entities cannot be investigated by science. In this sense, science and religion are separate and address aspects of human understanding in different ways. Attempts to put science and religion against each other create controversy where none needs to exist. According to Archbishop John Habgood, both science and religion represent distinct ways of approaching experience and these differences are sources of debate. He views science as descriptive and religion as prescriptive. He stated that if science and mathematics concentrate on what the world ought to be, in the way that religion does, it may lead to improperly ascribing properties to the natural world as happened among the followers of Pythagoras in the sixth century B.C. In contrast, proponents of a normative moral science take issue with the idea that science has no way of guiding "oughts". Habgood also stated that he believed that the reverse situation, where religion attempts to be descriptive, can also lead to inappropriately assigning properties to the natural world. A notable example is the now defunct belief in the Ptolemaic (geocentric) planetary model that held sway until changes in scientific and religious thinking were brought about by Galileo and proponents of his views. In the view of the Lubavitcher rabbi Menachem Mendel Schneerson, non-Euclidean geometry such as Lobachevsky's hyperbolic geometry and Riemann's elliptic geometry proved that Euclid's axioms, such as, "there is only one straight line between two points", are in fact arbitrary. Therefore, science, which relies on