Questions on Descartes' Epistemology

1. What is the point of Descartes' doubts about sense experience, dreaming, and the "evil genius"?
2. How can we doubt that we have a body but not that we have a mind?
3. How does the wax example indicate that, for Descartes, we can have knowledge about things in the world (at least as objects of mind)?
4. What does it mean to say that knowledge is justified true (i.e., accurate) belief?
5. What are some criteria for determining whether or not a belief is justified?