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郎天亦伯云
Descartes had a famous method called the method of doubt. He asked himself one big question: "What can I be really sure of?" He thought about many things. He believed in God, but he couldn’t be certain. He thought he lived in a rich country, but maybe he was fooled. He even wondered if his family and friends were real. He imagined an evil demon might trick him into believing fake things. The movie The Matrix uses this idea too. It is based on Descartes’ worry about the evil demon. Maybe everything we see and feel is not real. Maybe a bad creature makes it all up. But Descartes found one truth he could never doubt. He said, "I think, therefore I am". If he was being tricked, there must be a "him" to trick. Thinking proves he exists. This truth is the solid base for all his ideas.

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