Countries with extremely high tax rates sometimes collect less revenue than countries with moderate tax rates.

The Nile Delta is sinking — it's being weighed down by sediment and eroded by rising seas.

The Nile flows northward — it is one of the few major rivers in the world that flows from south to north.

There are places in Antarctica where no rain has fallen for millions of years.

The Ice Age shaped many of today’s landscapes.

Canada has more lakes than every other country combined.

The United States has no official language — English is the dominant language but is not legally designated.

Iceland sits directly on the Mid-Atlantic Ridge and is actually spreading by 2.5 cm per year as two tectonic plates diverge.

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