The Great Barrier Reef is located off the coast of Australia.

There are lakes beneath Antarctica’s ice.

The Great Emu War of 1932 involved Australian soldiers attempting to reduce emu populations.

More people live in Tokyo than in the entire country of Canada.

The Persian empire at its height stretched from Egypt to modern-day India, encompassing about 44% of the world's population.

The CIA conducted covert operations in Southeast Asia during the Vietnam War.

The Amazon rainforest is often called the lungs of the Earth.

There are mountains on Earth taller than Everest when measured from base to peak underwater.

Caribou migrate in large herds across Arctic regions.