What makes some witches/wizards become ghosts after they die andsome not?You don't really find that out until Book VII (5), but I can say that thehappiest people do not become ghosts. As you might guess MoaningMyrtle!
Since Harry Potter's parents were sorcerers and Petunia was Harry'smother's sister. Shouldn't Petunia be a witch or wizard?No. As Hagrid explains in Book I (1), sometimes a witch or a wizardoccurs in an otherwise Muggle family, just as a Squib is a non-magicperson who occurs in an otherwise magic family.
Do you think that you will write about Harry after he graduates fromHogwarts? Isn't there a University of Wizardry?No, there's no University for Wizards. At the moment I'm only planning towrite seven Harry Potter books. I won't say "never," but I have no plans towrite an eighth book.
When you were my age, did you ever write a book? I am in the 5th grade.Yes, as a matter of fact I did. I wrote a story about seven cursed diamonds. Ithought it was a novel. I think now it was really a very long short story.