Naturalism is a philosophy that views nature as the totality of reality and excludes the supernatural. It believes that life can be explained solely by material and chemical laws, with no existence of God or other world. Key proponents included Rousseau, Aristotle, Comte, Bacon, Darwin, Huxley, Spencer, and Epicurus. Naturalism's principles are that all human capacities are delimited by nature, and thoughts depend on physical circumstances and external stimuli. Its educational implications include aiming education toward perfecting the human machine and adaptation, using a curriculum focused on nature, games, sports, and allied subjects, and teaching methods like learning by doing, play-way, and observation.