Whiz, Bang, Zoom! Ethan Flask and Professor von Offel's Energetic Experiments (Mad Science)

Mr. Flask settles a food fight in the cafeteria with a lively unit on energy. And when his students find out he has a giant catapult in his basement, they're even more energized about the topic.So is Professor von Offel. He needs to get rid of those pesky long-lost relatives he mistakenly brought back to life. If he could just get his hands on the Flask family science papers locked up in the Arcana library, he might find a solution. Now, a giant catapult could be very handy for a break-in...