In "Birds in a Truck," Adam and Jamie tackle Sir Isaac Newton's founding principle of thermodynamics and the law of conservation of momentum. They're looking into a physics' classroom urban myth. If birds in a truck take flight do they lighten the load? Watch to see if the 'Busters will be outsmarted by a flock of pigeons ... Meanwhile, Grant, Tory and Kari become crime scene investigators. A photo found on the Net shows a speedboat impaled on a channel marker, almost neatly split in half. In an effort to get to the bottom of this watery fender bender, our intrepid CSI team goes on a high-speed joyride.