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And apparently it's quite popular.

Scholastic Inc. said yesterday that an estimated 6.9 million copies of "Harry Potter and the Half-Blood Prince" were sold in the United States in the first 24 hours the book was on sale, smashing the one-day sales record of 5 million set two years ago by the previous installment in the popular series.

The Times also calculated that Americans spent $117 million on Harry Potter and the Mulatto in Day One alone.

We so need to write a book.

Harry Potter Book Sets Record in First Day [NYT]