Wait...chocolate frogs? Jace really wasn't paying attention much, given that he was busy with keeping himself warm. If it had been something nice and warm like soup, then he'd be definitely drawn to it. Merlin, he'd really need to cast more powerful heating charms on his clothing, especially his socks. He can no longer feel the soles of his feet!

Now, onto the lesson.

Jace waited until all portraits were revealed, and realized right away that they all have something in common. This made the Ravenclaw sit up straighter, temporarily forgetting about the numbness he felt on his feet. Raising one pale hand in the cold air, Jace waited for his turn to answer. "That's Ignatia Wildsmith, professor. She invented the Floo Powder." As soon as he retracted his hand back, he already has his quill in his hand, listing down the other great minds in front of them, and jotting down what he knows about them.