1) The Great Barrier Reef in Australia is the largest coral reef system in the world and is visible from space.

2) The ancient city of Athens, Greece, is often considered the birthplace of democracy, where citizens had a say in the decision-making process.

3) The world's first paper money was created in China over 1,000 years ago.

4) The word "yesterday" contains three vowels: E, A, and A.