Harry Potter- something rare

General Facts Not Disclosed in the Books
(Facts go from newest to oldest, with newest on top)

• Prefects can take points; Ron got it wrong in Order of the Phoenix, which makes him a pretty poor prefect, eh?

• Fred and George Weasley were born on April Fools' day (no joke).
• Ginny Weasley's first name is Ginevra, and she is the first female Weasley born for "several generations," says JKR.
• Molly Weasley's maiden name is Prewett.
• Crookshanks is half Kneazle.
• Dean Thomas's father was killed by Death Eaters when he refused to join them. Neither Dean nor his mother know.
• Hogwarts has about a thousand students. (True, that number doesn't seem right, but J.K.R. said so, and she's the boss.)
• Hermione's birthday is September 19th; Ron's is March 1st.
• James Potter inherited lots of money and didn't need a well-paying profession.
• James Potter inherited the Invisibility Cloak from his father.
• Witches and wizards have longer life-spans than Muggles.
• The Gringotts' goblins return the Muggle money they acquire back into circulation.
• The approximate value of a Galleon is about five pounds ($7.30 or 8.00 Euro), though the exchange rate varies.
• Dumbledore is 150, McGonagall is 70 (and is really an old softy; she just doesn't act like it), Snape is 35 or 36.
• Hogwarts' school motto, "Draco Dormiens Nunquam Titillandus," means, "Never tickle a sleeping dragon."
• If placed in front of a mirror, the inscription on the Mirror of Erised ("Erised stra ehru oyt ube cafru oyt on wohsi") reads, "I show not your face but your heart's desire."
• The happiest people do not become ghosts (Therefore, we can assume that ghosts are people that died while sad, angry, etc. Myrtle was teased; Nearly Headless Nick didn't have his head completely chopped off; the Bloody Baron was...lonely?)
• The Hogwarts teachers do not stay at Hogwarts during the Christmas holidays. However, Filch, Hagrid, and Dumbledore do.
• A few of the Hogwarts professors have spouses, but that information is restricted for reasons we will find out about later.
  
• To remove the tail that Hagrid gave Dudley in the hut on the rock, the Dursleys went to a private hospital where the staff was very discreet, and said that a wart had gone out of control.
  
• There is more to the cats in the story (Crookshanks, Mrs. Figg's cats, Mrs. Norris, etc.) than meets the eye.
  
• The animal an Animagus turns into is a reflection on his/her personality.
  
• For Hagrid, keeping dangerous creatures is all about overcoming something that could kill him.
  
• Azkaban is in a sea north of the North Sea. A very cold sea.
  
• You can do unfocused and uncontrolled magic without a wand (like when Harry blows up Aunt Marge), but to perform really good spells, you need a wand.