Urban populations now exceed rural populations worldwide.

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

Fact #2603 · Geography

The longest river in the world is often considered to be the Nile.

Fact #908 · Geography

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

Fact #770 · Geography

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

Fact #1043 · Geography

The ocean contains structures larger than mountain ranges.

Fact #1773 · Geography

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

Fact #2769 · Geography

The Three Gorges Dam spans the Yangtze River.

Fact #1541 · Geography

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

Fact #3919 · Geography