One of the most puzzling questions in the Bible is where Cain, the firstborn son of Adam and Eve, found a wife. According to the book of Genesis, Cain killed his brother Abel out of jealousy, and was subsequently banished from the land where his parents and siblings lived. The text then states that Cain went to live in the land of Nod, where he knew his wife and had children. So where did Cain's wife come from? There are a few different interpretations of this question, but one common explanati…