The immortal jellyfish can revert to its juvenile polyp state after reproducing — theoretically cycling forever.

Penguins have excellent underwater vision.

Fact #1288 · Ocean

Prehistoric oceans had different currents than today.

Fact #740 · Ocean

Some volcanoes can erupt underwater without anyone noticing.

Fact #2248 · Ocean

Some species of octopus can change both color and texture.

Fact #343 · Ocean

The siphonophore can grow to extraordinary lengths in the ocean depths.

Fact #1408 · Ocean

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

Fact #2919 · Ocean

The Pacific Ocean covers nearly one-third of Earth's surface.

Fact #297 · Ocean

Coral reefs are formed by tiny marine animals called polyps.

Fact #98 · Ocean