Rene DesCartes (1596-1650), lived a life focused on mathematics, philosophy and science during a period of history that was not particularly accommodating for analytical thought. DesCartes stated that he had no way of being certain that everything he perceived was nothing more than something he created subconsciously in his mind, such as a in dream. This theory fails because dreams are built on knowledge we have of the external world, on bits and pieces of our real experience. One of his many noteworthy accomplishments was that he claimed to have proven the existence of God. His theory states ...

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• Grade Level: Undergraduate