ABSTRACT
In everyday life, in science, and in philosophy as well, the people talk about “knowing” things. Epistemologists try to evaluate the common-sense idea that the people have knowledge and that they are rationally justified in the beliefs the people have. A philosopher who claims that the people don't have knowledge, or that their beliefs aren't rationally justified, is defending some version of philosophical skepticism. Knowing that a proposition is true requires more than just having a true belief. If highly reliable evidence is enough to justify a belief, then the counterexamples do refute the JTB Theory. Skeptics claim that people don’t know anything. The argument for skepticism displayed in the previous paragraph is deductively valid. The skeptical argument contradicts a fundamental part of the people common-sense picture of the way they are related to the world around the reader.
