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Under Dumbledore's orders, Harry has to live with Vernon and Petunia Dursley (and their awful son, Dudley) when he isn't at Hogwarts.

Bill, Charlie, Percy, Fred, George, Ron and Ginny are the children of Arthur and Molly Weasley.

The hapless Neville Longbottom was given a happy ending as a Hogwarts professor.

The Mirror of Erised reflects nothing more or less than the deepest desire of a person's heart. Dumbledore bewitched the mirror to only reveal the sorcerer's stone to one who wanted to find the stone, but not use it.

While dueling with Harry, Draco Malfoy conjures a snake. Harry immediately commands the snake not to attack. The whole school hears him speaking Parseltongue (snake language), an ability generally associated with dark wizards.

The use of Avada Kedavra (the killing curse), Crucio (excruciating pain) and Imperio (which causes the victim to obey the spell-caster) are punishable by life in Azkaban.

In addition to her duties as head of Gryffindor, Professor McGonagall teaches Transfiguration.

50 years before Harry's time at Hogwarts, a student named Tom Riddle caught a young Hagrid raising Aragog, a baby Acromantula, in a dungeon cupboard. Aragog was blamed for attacking several students. Hagrid was expelled and had his wand snapped in half.

Defence Against the Dark Arts professor Quirinus Quirrell is revealed to be under Voldemort's control at the conclusion of the first book.

To ensure his own immortality, Lord Voldemort created an unprecedented 7 Horcruxes. Harry must find and destroy each of these if he hopes to stand a chance of ever defeating Voldemort.

Corpulent social climber Horace Slughorn replaced Severus Snape as Potion's Master at Hogwarts after Snape accepted the position of Defence Against the Dark Arts teacher.

Moaning Myrtle, the ghost of a former Hogwarts student who haunts the girls' bathroom, introduces Harry to the Tom Riddle diary.

Cho Chang was a year older than Harry and played Seeker for the Ravenclaw Quidditch team. Cedric Diggory asked her to the Yule Ball before Harry could work up the nerve, and to Harry's dismay, Cho then became Cedric's girlfriend.

Peter Pettigrew murders all-around good guy Cedric Diggory at the end of the fourth book in the series.

Bellatrix Lestrange was a Death Eater and most certainly not a member of the Order of the Phoenix.

When Draco Malfoy fails to kill Dumbledore, Snape steps in and does the deed.

Students with signed permission forms are allowed to visit Hogsmeade on select weekends. Third years also start new elective subjects. These can impact their career choices in later life.

The final Harry Potter book sold an astonishing 11 million copies within 24 hours of its release on July 21, 2007.

Rowling originally published only seven leather-bound copies of "The Tales of Beedle the Bard," but it was eventually released worldwide in December 2008.

The Wizarding World of Harry Potter is the sixth island in Universal Studios' Islands of Adventure in Orlando, Fla.

The enchantingly nasty Rita Skeeter used her talents as an unregistered animagus to spy on Harry and obtain information she needed to write a series of exposés during the Triwizard Tournament.

Fluffy is a huge, vicious three-headed dog who guards the sorcerer's stone. In exchange for a dragon egg, Hagrid tells a mysterious stranger he can get past Fluffy by playing a bit of music.

Severus Snape is the ultimate anti-hero. He does terrible things, but his love for Lily Potter never wavers. Harry names his middle son Albus Severus in honor of Snape's sacrifice.

Dobby, a house-elf belonging to the Malfoy family, visits Harry at the beginning of Book 2 to dissuade him from returning to Hogwarts. House-elves are small humanoid creatures who usually belong to wealthy Wizarding families.

Hagrid's three-headed dog, Sprout's devil's snare, Flitwick's charmed keys, McGonagall's transfigured chess board, Quirrell's troll, Snape's potions puzzle and Dumbledore's Mirror of Erised protected the sorcerer's stone.

Tom Marvolo Riddle was the last descendant of Salazar Slytherin -- but also a half-blood -- who transformed himself into Voldemort. The name is an anagram of "I am Lord Voldemort."

Lockhart used memory charms to bewitch local heroes so that he could claim their good deeds as his own. At the end of Book 2, he accidentally blasts himself with a powerful memory charm. As far as we know, he is still recuperating at St. Mungo's!

Tom Marvolo Riddle was the last descendant of Salazar Slytherin. After leaving school, he sank deeply into the dark arts, transforming himself into Voldemort. Riddle's birth name is an anagram for "I am Lord Voldemort."

Ginny Weasley captured Harry's heart in his 6th year at Hogwarts. They have three children together: James Sirius, Albus Severus and Lily Luna. Hermione marries Ron.

Harry's father was the wizard James Potter, and his mother, Lily, was a Muggle-born witch. They were killed by Voldemort when Harry was a baby.

McGonagall writes to the Ministry of Magic for permission to allow Hermione access to a time-turner, a small silver hourglass that enables Hermione to turn back time so that she can repeat hours and attend an excess of lessons.

Divination is a very imprecise branch of magic, and true seers are rare. However, Divination professor Sibyll Trelawney turns out to be the real deal; Harry witnesses her make two real predictions during his time at Hogwarts.

Shabby part-werewolf R.J. Lupin lands the job of Defence Against the Dark Arts teacher in Harry's third year. He teaches Harry to fend off Dementors with a Patronus charm.

Sirius Black, Harry's godfather, was wrongfully imprisoned for the murder of Peter Pettigrew. He escaped Azkaban by transforming into his dog animagus form, and he travelled to Hogwarts to commit the crime for which he was imprisoned.

Bellatrix Lestrange and other Death Eaters subjected Frank and Alice Longbottom to the Cruciatus curse in an attempt to force them to divulge information about Voldemort's whereabouts. The torture drove them insane.

Azkaban, the Wizarding prison, is guarded by Dementors, creatures who drain peace, hope and happiness out of the air around them. In a 2000 interview with The Times UK, Author J.K. Rowling revealed that the Dementors embody her own experience with depression.

Harry fears he's seen a Grim, a large black dog that portends death. However, the dog turns out to be his Godfather Sirius Black in his animagus form.

In 2003, the OED added "muggle," which the dictionary defines as "a person who possesses no magical powers ... a person who lacks a particular skill or skills, or who is regarded as inferior in some way."

In Dumbledore's office, Harry noticed a silvery glimmer from Dumbledore's Pensieve. His curiosity got the best of him and, before he knew it, he was witnessing Dumbledore's memory of the trial of the Longbottom's torturers.

Voldemort concocted a potion of his own invention to return himself to physical form. It contained unicorn blood, his father's bone, Harry's blood and Peter Pettigrew's flesh.

Thestrals, carnivorous, winged horse-like creatures invisible except to those who have seen death, pull the school carriages.

The flying Ford Anglia malfunctions as it nears Hogwarts, and the boys crash into the Whomping Willow. The car ejects Harry, Ron and their luggage and flees to the forbidden forest, where it takes to trundling around like a wild animal.

Bill, Charlie, Percy, Fred, George, Ron and Ginny are the children of Arthur and Molly Weasley. In Book 7, George loses an ear, and his twin Fred actually dies during the Battle of Hogwarts. The rest of the family escapes unscathed, at least physically.

The Quibbler, which is known for publishing wild conspiracy theories, is published by Luna Lovegood's father, Xenophilius Lovegood.

Fred and George Weasley may not have put much effort into schoolwork, but they had a positive genius for inventing novelty items, including canary creams, ton-tongue toffees, skiving snackboxes, extendable ears and much more!

When Dumbledore couldn't find anyone to fill the position, the Ministry passed a decree giving itself the authority to appoint someone. Dolores Jane Umbridge refused to teach practical defense and only taught theory.

Dumbledore's Army trained secretly in the Room of Requirement, right under Umbridge's nose!

Though Harry can't understand how it will possibly help, he eagerly accompanies Dumbledore through the Pensieve into a variety of memories concerning Tom Riddle (Lord Voldemort).

"Harry Potter and the Prisoner of Azkaban" is the only one without He-Who-Must-Not-Be-Named. He's mentioned, of course, but he never actually shows up.

Much to the dismay of Draco's mother, Lord Voldemort makes Draco a Death Eater and tasks him with the responsibility of murdering Albus Dumbledore.

Peeves damages an "extremely valuable" Vanishing Cabinet in Harry's second year. Draco hatches a plan to repair it and to use it and its twin at Borgin and Burkes to sneak Death Eaters into Hogwarts.

When Severus Snape was at Hogwarts, he signed his potions book with the nickname "Half-Blood Prince." Snape was a half-blood, and his witch mother's surname was "Prince."

Dumbledore left his Deluminator to Ron "in the hope that he will remember me when he uses it." To Harry, he left the sword of Gryffindor and the first snitch Harry had ever caught, which concealed the resurrection stone, one of the Deathly Hallows.

Harry thinks that if he can unite the Deathly Hallows (the invisibility cloak, the elder wand and the resurrection stone), he might survive a confrontation with Voldemort.

The Ministry of Magic spent at least a year magically constructing a stadium for the four hundred and twenty-second Quidditch World Cup.

Loathsome Aunt Marge speaks disparagingly about Harry's dead parents, and Harry gets so angry that he does uncontrolled magic, blowing Aunt Marge up like a balloon.

Mr. and Mrs. Dursley of No. 4, Privet Drive, were proud to say that they were perfectly normal, thank you very much.