Beakman explains that steam has a lot of power behind it and that a man named Hero in Ancient Greece figured out how to use it to make a ball spin. However, it wasn't until the invention of the steam engine that people knew how to use steam. Beakman uses a model to explain how the steam moves the piston back and forth to turn a wheel, which is how steam engine trains work.
Beakman explains how a helicopter has a rotating wing on top that helps it stay up because of the air pressure difference created by the shape of the wing. Then he explains that the back propeller helps steer the helicopter.
Victor Hess tests his own hypothesis of cosmic radiation by using a hot air balloon and checking the radiation in the atmosphere. He noticed that it did indeed increase as he traveled higher up in the air.