Switzerland has a policy of armed neutrality — every citizen keeps a rifle at home.

Around 90% of the world's population lives in the Northern Hemisphere.

The Colosseum in Rome demonstrates advanced ancient engineering.

Mount Everest is not the closest point to space — due to Earth's equatorial bulge, Mount Chimborazo in Ecuador is actually closest to the stars.

There are places on Earth that have never been explored.

The coldest temperature recorded on Earth occurred in Antarctica.

The Dead Sea lies at one of the lowest elevations on land.

The Atacama Desert in Chile is so dry that some weather stations there have never recorded rain.

The London Underground is one of the oldest metro systems in the world.