I'm new to this string theory, but from what I've read (The Elegant Universe and a few papers), I realize that a good knowledge of the string theory requires a strong understanding of these Calbi-Yau spaces. Being a sophomore in college, I don't yet posess the mathematical abilities to fully comprehend what the formulas in the papers I've read mean; so they are pretty much useless to me. Apart from being a plank size bundle of spatial dimensions, I really have not a clue of what Calbi-Yau spaces are. Apart from the 4 dimensions we live in, I really don't know where to begin on understanding the other 7. If anyone can help me understand Calbi-Yau spaces, that would be great.