8. The world is perceived through our sense. all reliable knowledge about the world, It is the principle of empiricism.
9. Our perceptions, memory, and reasoning can be trusts. Scientists assume that our senses are relatively reliable agencies for acquiring facts, but this does imply that safeguards such as intersubjective testability built into the scientific method of analysis. all perceptions, memories, and reasons are reliable. Therefore, scientist suggests that empirical strategy is more reliable approach to the acquisition of knowledge about the world than any of the alternatives.