Brazil shares a border with every country in South America except Chile and Ecuador.

The Aswan High Dam controls flooding of the Nile River.

The ocean contains structures larger than mountain ranges.

The deepest part of the ocean could submerge Mount Everest.

The Pentagon Papers revealed previously undisclosed details about U.S. involvement in Vietnam.

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

Mount Olympus on Mars stands about 13 miles high — nearly three times the height of Mount Everest.

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

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