Why doesn’t Descartes simply determine what’s real by looking around him and use his sense experience?

Please pick one of the following questions to answer for the forum this week: • Why doesn’t Descartes simply determine what’s real by looking around him and use his sense experience? • In Meditation II, Descartes states, “I am; I exist – this is certain.” Explain why Descartes claims that his knowledge here about this cannot be doubted? • What is the nature of the “I” for Descartes and why doesn’t it refer to the physical body of Descartes?