The Amazon River discharges 20% of all freshwater entering Earth's oceans.

China and India together contain over one-third of humanity.

Wealth inequality exists in nearly every country.

The Amazon River is one of the longest rivers in the world.

The Black Death originated in Central Asia and wiped out roughly half the population of Europe in under a decade.

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

The bubonic plague killed about one-third of Europe's population in the 14th century.

The Tour de France is one of the most famous cycling races in the world.

The highest navigable lake in the world is Lake Titicaca, shared between Peru and Bolivia at 12,507 feet.