Mental Floss host John Green presents a series of facts people may not know about the Harry Potter (previously) series in a recent episode of List Show. The video contains spoilers for the series, but some spoiler-free examples include the fact that J.K. Rowling is the only person to become a billionaire by writing books, there was a lice outbreak among the young cast while filming the movies, and the kids also used to hide snacks in their wizard robes.
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