"...you're not Professor Snape?"
Dumbledore smiled, "alas, I am not. I am, however, well-versed in the art of Alchemy."
"...will you be teaching us, Headmaster?" Cedric queried.
Dumbledore nodded, eyes twinkling, "I've heard so much about each of you-"
The lone 4th Year sank deep into her chair.
"-that I found myself intrigued."
The class nodded along, baring Pucey who was frowning, eyes glaring at his desk.
"Now, we shall begin our studies with the theories of Aristotle. Ponder this," words magically appeared on the blackboard. "Is it possible for something to be both hot and cold?"