In the past two or three decades, the world has witnessed the world's most dramatic changes. The world has also undergone great changes, including wars, famines, and natural disasters. Today, we can look back at the past and see how far we have come in our understanding of the world. We can also look back to the past to see how much we have learned about the world and the people in it. Today we can take a look at the world through the eyes of the people who live in it and see what has changed.