How can one person change the world?

A person can change the world by making new inventions or improving something and it can spread across the world. This can make a change to the world. For example, if someone makes a medicine then it can help more people from dying from that disease and this is some change to the world since people will survive and there will be more population.

This is a picture of my slideshow for a person called Charles (Turnip) Townshend. He has made some big changes in the agricultural industry. He made a invention called the four-field crop rotation and without him all the crops would not grow at the same time.