Read the excerpt from "On Becoming an Inventor" by Dean Kamen. Two of Kamen's more recent inventions are the Ibot, a wheelchair that can safely climb stairs, and a self-balancing scooter, called the Segway. The Segway is battery powered and contains five gyroscopes that keep it balanced under almost any circumstance. Kamen believes it may change the way people move around in crowded cities, reducing the amount of car traffic and auto emissions in many parts of the world. Based on this excerpt, what fact supports Kamen’s belief that the Segway may change the way people move around crowded cities?