Denmark is consistently ranked the world's happiest country — due to trust, equality, and social safety nets.

The Sahara Desert was once much greener than it is today.

The Three Gorges Dam spans the Yangtze River.

Australia is wider than the Moon — the continent spans about 4,000 km coast to coast.

The Golden Gate Bridge was completed in 1937.

There is more water in Earth's mantle than in all the oceans on the surface.

Mount Everest is not the closest point to space — that title goes to Mount Chimborazo in Ecuador due to Earth's equatorial bulge.

Mount Everest grows slightly each year due to tectonic activity.

The Andes mountains were formed by tectonic activity.