By now, most people know there are legions of devoted Harry Potter fans. But perhaps none are as obsessed as these two sisters, reports The Early Show national correspondent Hattie Kauffman.
They can't stop reading "Harry Potter." They have read the entire series over and over again. One positive impact is that Natalie is now an author, in a manner of speaking. She got so tired of waiting for the fifth Potter book, she wrote her own.
Referring to "Harry Potter and the Order of the Phoenix," she says, "I wrote that when I was 12 and 13."
And she just finished another 800 pager: Her own version of how Potter's adventures should continue in book six, to be released in the U.S. at midnight.
She says she has read the first book 51 times. That is the same number of times she has read the second, the third, and the fourth books, she says laughing.
For Emma it's been 48 times, she says.
To be clear, Natalie and Emma Jacobson are not nuts. They're 4.0 students who excel in subjects like algebra and history.
"We don't have, like, cable, and we don't have any friends that live really close," Emma says.
But they have plenty of literary friends.
Showing her room, Natalie says, "This is my own chamber of secrets." With every wall papered in Potter, she's begun to decorate the ceiling. It's not your average girl's room.
"No," Natalie says, "It's definitely a little different."
She agrees it is safe to say that she is obsessed.
Melissa Jacobsen indulges her girls' Potter mania, even so far as taking them to London for the premiere of the movie, "Prisoner Of Azkhaban," where they stood in the rain for hours hoping to meet author J.K. Rowling.
Their mother is not worried about her daughters getting carried away with Harry Potter.
"Oh no, no, no, no, no, no. No," she says, "Because what a great obsession, actually. You know there could be some, I mean, it's not Lindsey Lohan posters, Britney Spears; I mean this is really positive."
Of course, every new Harry Potter book is awaited eagerly by fans. But few devour them as fast as Natalie.
She says, "The fifth one, when we got it at midnight, I just stayed up and read it until, like, 5:30 in the morning, and then I'm, like, looking at the clock and,'Oh 5:30, I should go to bed now.' And then I started it again that night."
Natalie notes, "See, I've read this book so many times that it is so completely worn out, look at this."
As the whole world knows, "Harry Potter and the Half-Blood Prince" goes on sale at 12:01 a.m. Saturday. It is the sixth installment in the seven-volume series.
In case you're wondering, in Natalie's sixth book, the plot takes some interesting twists. She has Harry discovering he has a twin sister, who, by the way, seems to be based on Natalie.
But would these obsessed fans pass a Pop Potter Quiz?
Question No.1: What are the three types of balls used in Quidditch?
Natalie's answer: "Bludger, Quoffle, Snitch."
Question No. 2: What did the Dursleys give Harry for his 10th birthday?"
Natalie's answer: "Oh, his 10th one? 'Cause they're always giving him, like, either a sock or a piece of coal or a Kleenex, or just something like that. Or a clothes hangar."
Question No.3: What kind of creature is Norbutt the Norwegian ridgeback?"
In unison, Natalie and Emma answer: "Dragon!"
The answers, no surprise, were correct.
And so life goes on in the little house in Oregon: Two girls inspired by magic and maybe a little witchcraft.