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

2) The Age of Exploration, during the 15th and 16th centuries, saw European explorers such as Christopher Columbus and Vasco da Gama reach new lands and establish trade routes.

3) Mountains are important water sources, as they capture and store precipitation, feeding rivers and supporting ecosystems downstream.

4) Male seahorses are the ones who give birth to their offspring.