A Trebuchet is a giant, lever-based catapult. Phil uses it to hurl pumpkins! Mechanical advantage and the history of the trebuchet are what's being tossed your way on this episode, along with a lot of ...

Episode 2 Elasticity 21 mins 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 ...

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 ...