About 50% of marriages end in divorce in many developed countries.

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.

The entire population of Earth in 1 AD was around 300 million — roughly equal to the current population of the United States.

The ocean contains structures larger than mountain ranges.

In 1896, two countries fought a war that lasted under 45 minutes.

The tallest mountain from base to peak is Mauna Kea in Hawaii — it's just mostly underwater.

The Amazon River discharges more fresh water into the ocean than the next seven largest rivers combined.

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

The Andes Mountains stretch along South America's western coast.