1. We often hear that the world is said to be getting smaller.
2. They don't mean that the world is literally getting smaller, of course.
3. But 2300 years ago, the Egyptians and the Greek thought that the world was flat and very small that around it was the ocean.
4. Then, men began to use ships to explore the world.
5. And they discovered new countries which they didn't know about.
6. They found that as they sailed further away from their home countries, the world became bigger.
7. As they built bigger and bigger ships, they were able to sail further and further away.
8. What they mean is that with modern means of transport, we can now reach every part of the world very quickly.
9. And they discovered new countries which they didn't know about.
10. Today, there're no undiscovered countries left to put on the map, but there are many new worlds to discover out in space.