Descartes comes to the conclusion that even if he is being deceived about everything else, he can be absolutely certain that he exists. But is this conclusion really so certain as he thinks it is? Is...

Descartes comes to the conclusion that even if he is being deceived about everything else, he can be absolutely certain that he exists. But is this conclusion really so certain as he thinks it is? Is it possible for an all-powerful God or evil genius to deceive him even about his own existence? Why?