The Cambrian period introduced many early marine animals.

The Pacific Ocean is larger than all of Earth's landmasses combined.

Some deep-sea octopuses brood their eggs for years.

The U.S. once detonated nuclear weapons underwater near its own ships for testing.

Nostalgia was once classified as a medical disorder — Swiss physicians in the 17th century believed it was a brain disease.

The mimic octopus can imitate other sea creatures.

You are more likely to die from heart disease than any other cause.

Certain whales migrate thousands of miles annually.

The Panama Canal connects the Atlantic and Pacific Oceans.