In Descartes' First Meditation, Descartes writes that he has come to the conclusion that many of the opinions he held in his youth are doubtful, and consequently all ideas built upon those opinions are also doubtful. He deduces that he will have to disprove his current opinions and then construct a new foundation of knowledge if he wants to establish anything firm and lasting that is absolutely true in the sciences. But rather than disprove …showed first 75 words of 734 total…

…showed last 75 words of 734 total…If I live in my own world, with my own reality, and "person A" lives in his own world with his own reality, how is it that I can talk to "person A", coexist in the same environment, and be able to share similar thoughts in relationship to the world? It's a nice thought, and was probably a valid argument in the 1800s, but I do not think that it has any real merit today.