Here are some spell-binding numbers for you Harry Potter fans and observers:
- 325 million - number of copies the first six books in the series have sold worldwide.
- 66 - number of languages Harry Potter books have been published in.
- 6.9 million - number of Half-Blood Prince copies sold in the 24 hours after it went on sale in 2005 (more than The Da Vinci Code sold…
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