Latest:
● Made nearly 100 updates and additions to the Wizarding History of Time timeline.

● Added new article on The Sword of Gryffindor.

● Released a new section of the Encyclopedia: The Harry Potter Calendar. Find out what happened in Potterworld on any day of the year!

● Created an entire new version of the Potions section with very detailed descriptions and full citations.

Appearance: They probably look like ordinary Muggle yo-yos.

Function: To annoy people like Argus Filch with their noise while causing no end of amusement to Hogwarts students with, well, their noise.

How to Use: They are probably used like ordinary yo-yos, too.

Notes: Screaming Yo-yos were added to the list of objects forbidden within Hogwarts Castle during Harry's fourth year.