In 1781, James Watt invented a steam engine that did the work of 10 horses. It seemed unlikely that these engine would change how people lived and worked. However, within 100 years, the work of some steam engine was equal to that of 10,000 horses. Because of this, fewer framers were needed on the farms. Worker moved to the city to work in the factories. At first, life for the workers was difficult. Then, they got together to form workers’ unions and began to fight for better wages. Later, electricity change people’s lives again, and then came automobiles. More recently, computers have changed our lived once again.