1) The Great Wall of China is not visible from space without aid, contrary to popular belief.

2) The Great Rift Valley is a geological feature that stretches over 6,000 kilometers (3,700 miles) from Lebanon to Mozambique. It is known for its diverse landscapes, including deep lakes, volcanic mountains, and fertile valleys, and is considered a significant site for the study of Earth's tectonic activity.

3) The discovery of the Americas by Christopher Columbus in 1492 opened up new trade routes and had a profound impact on world history.

4) The word "table" contains two vowels: A and E.