The Limits of Skepticism

Can a person be skeptical about everything, or are there limits? Is it possible to doubt everything, or almost everything? Are there beliefs you possess that cannot be challenged or shown to be false? How might the skeptic respond to your claim that such a belief cannot be doubted? Identify one such specific belief and present your response to the skeptic. (If you don’t have such a belief, explain how one could live while not accepting any claim as true.)