Descartes

How I Know that I exist and everything around me is real? If we start to make us questions like Descartes we probably end in a huge dilema were we find out that existence is really difficult to prove and that we can never be sure about reality. Descartes think that only in a logical way we can explain Universe, logical explanations like math and science, and then he said that only reason will explain us everything. This thought help a lot in world because some people try to find a logical explanation on everything that is no always the best way to understand, but also discover some of the big lies in Universe, like religion that if you cant explain it in a reasonable way you shouldnt believe on it. Is sometimes difficult to understand how Descartes was against sence perception because if you want to built a "true" knowledge you should built it throught experiences, but Descartes said that we cant trust on sences because we cant be sure if we are in a dream and we cant be sure about true reality. Descartes let us huge questions that let us thinking why we are sure of everything and why we beleive on thinks without doubt about them.