다음 채널에서 시청 가능: Tubi
시즌 1, 에피소드 3: Phil starts with a Popsicle stick catapult. Then he uses everything he knows about elastic energy to build a full-size catapult that hurls pumpkins! Plus, a maxed out paddle wheel boat and a historical re-enactment (sort of) of how catapults were used in medieval days.
Educational · 2015년 9월 14일 · 21분