Squibs are related to witches or wizards without magical abilities. They are often more integrated into wizarding world than Muggle-borns. Some Squibs choose to cut themselves off from wizarding world
Alice falls down a rabbit-hole after seeing a White Rabbit with a watch. She finds herself in a dark hall with locked doors. She uses a "Drink Me" bottle to shrink to ten inches. She eats a cake to grow larger, reaching nine feet
Grindelwald attended Durmstrang Institute, where he was expelled at 16. He lived with Bathilda Bagshot in 1899 while hunting invisibility cloak. Met and fell in love with Dumbledore in 1899, forming blood pact
Muggle refers to non-magical people lacking magical abilities. Term differs from Squib (magical parents without power) and Muggle-born (magical parents). Muggles are often portrayed as foolish and oblivious to wizarding world. Ministry of Magic sends Obliviators to forget Muggles observing magic
Quidditch was the most popular wizarding sport played on flying broomsticks. Game evolved from ancient broomstick games like Stichstock and Creaothceann. First recorded game occurred in Queerditch Marsh around 1050. Golden Snitch was invented in 1269 as substitute for Snidget
Sirius is the last heir of the House of Black, named after the Dog Star. He was unhappy with his family and rejected pure-blood elitism. At Hogwarts, he was popular with James Potter, known for his good looks. Left home at 16, leaving his mother burning his name off the family tree