25 things you might not know about ‘Harry Potter,’ from John Green

'Harry Potter' became one of the most successful franchises in history

What began as a story written in cafés by an unknown author grew into a global phenomenon—spanning seven books, eight films, theme parks, and video games—reshaping modern popular culture.

The ‘Harry Potter’ franchise is valued at more than $32B

Combining book sales, films, theme parks, and merchandise, Harry Potter ranks among the world’s highest-grossing media franchises—estimated at more than $32B in total value, alongside giants like Star Wars and Marvel.

'Harry Potter’ transformed the young adult publishing industry

The series’ success reshaped the market for youth fiction. In 1997, about 3,000 young adult titles were published annually. By 2009, that number soared to 30,000 as publishers chased the next major phenomenon.

Read JK Rowling's original 'Harry Potter' pitch that a dozen publishers rejected.

'Harry Potter’ became the first kids' book to top the New York Times list since 1952

After its 1998 US release, "Harry Potter and the Sorcerer’s Stone" reached No. 1 on The New York Times Best Seller list—the first children’s book to do so since "Charlotte’s Web." By September 1999, the first three books held the top three spots on the list.

'Harry Potter' dominance led The New York Times to create a new bestseller list

In 2000, The New York Times introduced a separate bestseller list for children's books after Harry Potter titles occupied top spots on the main list for more than a year.

'Harry Potter’ ranks among the highest-grossing film franchises in history

The eight Harry Potter films earned $7.7B worldwide, placing the series alongside Star Wars, Marvel and James Bond as one of the top-grossing movie franchises ever produced. Watch a comparison over time here.

JK Rowling first thought of 'Harry Potter' on a delayed train in 1990

The idea for a young boy discovering he was a wizard came to Rowling during a train ride from Manchester to London. Over the next seven years—while facing personal loss and financial hardship—she completed the first book as a single mother living on welfare.

One 'Harry Potter' fan fiction deals with cognitive science and philosophy

Eliezer Yudkowsky's "Harry Potter and the Methods of Rationality" is not your typical fan fiction: It uses JK Rowling's fictional universe to wrestle with rationalist philosophy and the physics behind the magic taught at Hogwarts. The book went on to become popular in Silicon Valley, especially in the effective altruism movement.

Translating ‘Harry Potter’ required creativity across 60+ languages

This Vox video explores how translators adapted JK Rowling’s wordplay, invented spells, and cultural references—reimagining names and magical terms while attempting to preserve humor, rhythm, and meaning for readers around the world.

Early reviews turned ‘Harry Potter’ into an unexpected hit

Though only 500 hardback copies of "The Philosopher’s Stone" were printed in 1997—and mostly sent to libraries, due to doubts it would sell—glowing reviews and word of mouth fueled a surge in demand. Within a year, the book had sold more than 70,000 copies in the UK.

Rowling adopted initials to appeal to young male readers

At her publisher’s suggestion, Joanne Rowling used the pen name “JK Rowling,” believing boys might be less likely to buy a fantasy novel written by a woman.

Go behind the scenes of the making of the ‘Harry Potter’ films

See a rare look at how the beloved series was brought to life—from set design and visual effects to interviews with cast and crew who shaped the wizarding world on screen.

Listen to an academic analysis of the 'Wizarding World of Harry Potter'

Potterversity examines the Harry Potter series through an academic lens—inviting scholars from diverse fields to uncover new interpretations and deeper meanings within the book series.

Researchers found that reading ‘Harry Potter’ made children more tolerant

Psychological research showed that children and young adults who read Harry Potter developed greater empathy and more accepting attitudes toward marginalized groups.

'Harry Potter’ book launches became midnight cultural events with strict rules

As anticipation grew, bookstores worldwide hosted midnight release parties for new Harry Potter titles—drawing crowds in costume, complete with games and countdowns, transforming book launches into global celebrations of reading. Libraries and stores were required to adhere to strict regulations over who could handle the books before the official debut.

Jane Austen by the numbers

This feature from the Guardian takes a unique approach to Austen's literature, breaking her life, work, and fandom down into data. The slide deck includes comparative analyses of character employment, net worth, and age. Below is a breakdown of Austen's unexpected posthumous rise to fame.

Imagining how genetics works in 'Harry Potter' and how muggle-born Hermione is a witch

Dr. Robert Pyatt, director of Sanford Health’s medical genetics lab, talks through real-world genetics scenarios in the Harry Potter series, from the Weasley's red hair and freckles to why Hermione, a witch, could be born to "muggle"—or nonmagical—parents.

'Harry Potter’ follows a young wizard’s battle against evil

The seven-book series traces Harry’s journey from an orphan discovering his magical heritage to confronting the dark wizard Lord Voldemort. Alongside friends Hermione and Ron, he faces loss, power, and moral choice in a world divided between good and evil.

MuggleNet became the internet's largest 'Harry Potter' fan community

Launched in 1999, MuggleNet attracted millions of readers with news, theories, and fan-fiction. It helped define early online fandom, later expanding into podcasts, books and events.

Researchers found that reading 'Harry Potter' made children more tolerant

Psychological research showed that children and young adults who read Harry Potter developed greater empathy and more accepting attitudes toward marginalized groups.

The first ‘Harry Potter’ book was retitled for US readers

Scholastic changed "Harry Potter and the Philosopher’s Stone" to "Sorcerer’s Stone" in 1998, fearing the original title sounded too academic and might confuse American readers unfamiliar with the word’s magical meaning.

JK Rowling’s comments on transgender issues have sparked controversy and boycotts

Since 2019, Rowling’s public statements on gender and trans issues have prompted widespread backlash, leading many fans to attempt to distance her views from the Harry Potter series.

HBO is developing a decade-long ‘Harry Potter’ television series

Announced in 2023, the adaptation will retell all seven books across multiple seasons, with new casting and JK Rowling as executive producer. HBO says the series is set to premiere in 2027.

King has published more than 60 novels

Since 1974, the writer has published a staggering number of books, often releasing a title a year (and sometimes more than that). This comprehensive list from King's official website lists everything the man has ever done, including unpublished stories, long-forgotten television specials, and limited edition novels. It's a fascinating look into the artistic life of one of America's most successful writers.

Several bestsellers began as fan fiction

Ali Hazlewood's "The Love Hypothesis" began as "Star Wars" fan fiction. Cassandra Clare's "Mortal Instruments" series was about "Harry Potter" characters Draco Malfoy and Ginny Weasley. Anna Todd's "After" series was an example of "real life fiction," or fan fiction that is about real people rather than fictional ones (the books were originally based on the boy band One Direction).

Exploring the life of Colleen Hoover, one of romance's most popular authors

The writer is one of the bestselling names in fiction, with her book sales in 2022 surpassing those of the Bible. This profile unpacks her fast rise to fame, including the story behind her first book, which began as a self-published e-book but quickly found its way onto the New York Times bestseller list.

MuggleCast is the original ‘Harry Potter’ fan podcast

Launched in 2005 by the creators of MuggleNet, MuggleCast offers weekly discussions, news and fan theories on Harry Potter. It quickly became one of the internet’s major fandom podcasts and still runs today.

Fan fiction has slowly become a part of mainstream publishing

In 2025, the SenLinYu fantasy novel "Alchemised," which began as "Harry Potter" fan fiction, became a bestseller after being traditionally published; its movie rights were sold for over $3M. The mainstreaming of the genre is due to a combination of factors, including publishing's interest in the hard metrics that fan fiction websites provide.

The New York Public Library reveals its 10 most checked-out books of all time

In the library’s 125-year existence, these were the 10 most popular books — and one book that isn’t on the list, but should be.

How famous writers chose their pen names

From Joseph Conrad to JK Rowling, writers employ pseudonyms for all kinds of reasons. How they find those pseudonyms, however, depends on the individual.

'Harry Potter’ inspired a real-life version of Quidditch

Created by college students in 2005, the broomstick-based sport became an international phenomenon with organized leagues and World Cup tournaments. Now called Quadball, it’s played in more than 40 countries worldwide.

Famed historian David McCullough on five things to know about the Wrights

The bestselling author of popular, beloved histories on US presidents, engineering feats and disasters published a study of the Wrights in 2015. Here. he highlights five key facts to know about the brothers, including that their efforts were bootstrapped—meaning they paid for their work themselves with no outside investors.

Hogwarts Legacy was 2023’s bestselling video game

Set a century before the books, Hogwarts Legacy lets players explore an open-world version of the wizarding world. Released in 2023, it sold more than 30 million copies worldwide, topping global sales charts.

'Carrie' kick-started a wildly successful career

King has published more than 60 novels—along with dozens of novellas, hundreds of short stories, and several collections of nonfiction—and has sold over 400 million books. This 2024 interview finds him reflecting on his debut novel, and breakthrough hit, "Carrie," and the wild success that followed.

Four directors shaped the evolving tone of the ‘Harry Potter’ films

Across eight movies, Chris Columbus, Alfonso Cuarón, Mike Newell, and David Yates each brought a distinct vision—from early wonder to darker maturity—charting the series’ shift from children’s fantasy to coming-of-age epic.

In 1996, King had 6 books on the New York Times bestseller list

Stephen King has been wildly popular for decades, but he was never more visible than in the 1990s—especially for one week in 1996. All six volumes of the serialized novel "The Green Mile" appeared on the New York Times bestseller list. Reading the article not only provides some context for King's ubiquity, but also hints at what would become a norm in publishing: a few big-name authors dominating the charts with their popular series. (Some users may experience a paywall.)