Rock and roll emerged from the convergence of blues, gospel, and country music in the American South.

Pandas have thick fur to survive in mountainous regions.

The ocean contains structures larger than mountain ranges.

The ocean contains structures larger than mountain ranges.

The ocean contains structures larger than mountain ranges.

The shortest commercial flight in the world operates between two Scottish islands — Westray to Papa Westray — lasting about 90 seconds.

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

The deepest point in the ocean is deeper than Mount Everest is tall.

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